diff --git a/.travis.yml b/.travis.yml
index 12b4af996..6a33a1936 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -83,18 +83,23 @@ script:
   - opt_set TEMP_SENSOR_1 1
   - build_marlin
   #
-  # Test 3 extruders on RUMBA (can use any board with >=3 extruders defined)
+  # Test 5 extruders on AZTEEG_X3_PRO (can use any board with >=5 extruders defined)
   # Include a test for LIN_ADVANCE here also
   #
-  - opt_set MOTHERBOARD BOARD_RUMBA
-  - opt_set EXTRUDERS 3
-  - opt_set TEMP_SENSOR_2 1
+  - opt_set MOTHERBOARD BOARD_AZTEEG_X3_PRO
+  - opt_set EXTRUDERS 5
+  - opt_set TEMP_SENSOR_1 1
+  - opt_set TEMP_SENSOR_2 5
+  - opt_set TEMP_SENSOR_3 20
+  - opt_set TEMP_SENSOR_4 999
+  - opt_set TEMP_SENSOR_BED 1
   - opt_enable_adv LIN_ADVANCE
   - build_marlin
   #
   # Test PIDTEMPBED
   #
   - restore_configs
+  - opt_set TEMP_SENSOR_BED 1
   - opt_enable PIDTEMPBED
   - build_marlin
   #
@@ -158,11 +163,12 @@ script:
   - opt_enable EEPROM_SETTINGS EEPROM_CHITCHAT M100_FREE_MEMORY_WATCHER M100_FREE_MEMORY_DUMPER M100_FREE_MEMORY_CORRUPTOR INCH_MODE_SUPPORT TEMPERATURE_UNITS_SUPPORT
   - build_marlin
   #
-  # Mixing Extruder
+  # Mixing Extruder with 5 steppers
   #
   - restore_configs
+  - opt_set MOTHERBOARD BOARD_AZTEEG_X3_PRO
   - opt_enable MIXING_EXTRUDER
-  - opt_set MIXING_STEPPERS 2
+  - opt_set MIXING_STEPPERS 5
   - build_marlin
   #
   # Test DUAL_X_CARRIAGE
diff --git a/Marlin/Conditionals_LCD.h b/Marlin/Conditionals_LCD.h
index d69b1b1ec..734df230f 100644
--- a/Marlin/Conditionals_LCD.h
+++ b/Marlin/Conditionals_LCD.h
@@ -374,7 +374,7 @@
   /**
    * Set a flag for any enabled probe
    */
-  #define PROBE_SELECTED (ENABLED(PROBE_MANUALLY) || ENABLED(FIX_MOUNTED_PROBE) || ENABLED(Z_PROBE_ALLEN_KEY) || HAS_Z_SERVO_ENDSTOP || ENABLED(Z_PROBE_SLED))
+  #define PROBE_SELECTED (ENABLED(PROBE_MANUALLY) || ENABLED(FIX_MOUNTED_PROBE) || ENABLED(Z_PROBE_ALLEN_KEY) || HAS_Z_SERVO_ENDSTOP || ENABLED(Z_PROBE_SLED) || ENABLED(SOLENOID_PROBE))
 
   /**
    * Clear probe pin settings when no probe is selected
diff --git a/Marlin/Conditionals_post.h b/Marlin/Conditionals_post.h
index e96ffb7b9..78a73b27c 100644
--- a/Marlin/Conditionals_post.h
+++ b/Marlin/Conditionals_post.h
@@ -435,18 +435,100 @@
   /**
    * Shorthand for pin tests, used wherever needed
    */
+
+  // Steppers
+  #define HAS_X_ENABLE      (PIN_EXISTS(X_ENABLE))
+  #define HAS_X_DIR         (PIN_EXISTS(X_DIR))
+  #define HAS_X_STEP        (PIN_EXISTS(X_STEP))
+  #define HAS_X_MICROSTEPS  (PIN_EXISTS(X_MS1))
+
+  #define HAS_X2_ENABLE     (PIN_EXISTS(X2_ENABLE))
+  #define HAS_X2_DIR        (PIN_EXISTS(X2_DIR))
+  #define HAS_X2_STEP       (PIN_EXISTS(X2_STEP))
+  #define HAS_Y_MICROSTEPS  (PIN_EXISTS(Y_MS1))
+
+  #define HAS_Y_ENABLE      (PIN_EXISTS(Y_ENABLE))
+  #define HAS_Y_DIR         (PIN_EXISTS(Y_DIR))
+  #define HAS_Y_STEP        (PIN_EXISTS(Y_STEP))
+  #define HAS_Z_MICROSTEPS  (PIN_EXISTS(Z_MS1))
+
+  #define HAS_Y2_ENABLE     (PIN_EXISTS(Y2_ENABLE))
+  #define HAS_Y2_DIR        (PIN_EXISTS(Y2_DIR))
+  #define HAS_Y2_STEP       (PIN_EXISTS(Y2_STEP))
+
+  #define HAS_Z_ENABLE      (PIN_EXISTS(Z_ENABLE))
+  #define HAS_Z_DIR         (PIN_EXISTS(Z_DIR))
+  #define HAS_Z_STEP        (PIN_EXISTS(Z_STEP))
+
+  #define HAS_Z2_ENABLE     (PIN_EXISTS(Z2_ENABLE))
+  #define HAS_Z2_DIR        (PIN_EXISTS(Z2_DIR))
+  #define HAS_Z2_STEP       (PIN_EXISTS(Z2_STEP))
+
+  // Extruder steppers and solenoids
+  #define HAS_E0_ENABLE     (PIN_EXISTS(E0_ENABLE))
+  #define HAS_E0_DIR        (PIN_EXISTS(E0_DIR))
+  #define HAS_E0_STEP       (PIN_EXISTS(E0_STEP))
+  #define HAS_E0_MICROSTEPS (PIN_EXISTS(E0_MS1))
+  #define HAS_SOLENOID_0    (PIN_EXISTS(SOL0))
+
+  #define HAS_E1_ENABLE     (PIN_EXISTS(E1_ENABLE))
+  #define HAS_E1_DIR        (PIN_EXISTS(E1_DIR))
+  #define HAS_E1_STEP       (PIN_EXISTS(E1_STEP))
+  #define HAS_E1_MICROSTEPS (PIN_EXISTS(E1_MS1))
+  #define HAS_SOLENOID_1    (PIN_EXISTS(SOL1))
+
+  #define HAS_E2_ENABLE     (PIN_EXISTS(E2_ENABLE))
+  #define HAS_E2_DIR        (PIN_EXISTS(E2_DIR))
+  #define HAS_E2_STEP       (PIN_EXISTS(E2_STEP))
+  #define HAS_E2_MICROSTEPS (PIN_EXISTS(E2_MS1))
+  #define HAS_SOLENOID_2    (PIN_EXISTS(SOL2))
+
+  #define HAS_E3_ENABLE     (PIN_EXISTS(E3_ENABLE))
+  #define HAS_E3_DIR        (PIN_EXISTS(E3_DIR))
+  #define HAS_E3_STEP       (PIN_EXISTS(E3_STEP))
+  #define HAS_E3_MICROSTEPS (PIN_EXISTS(E3_MS1))
+  #define HAS_SOLENOID_3    (PIN_EXISTS(SOL3))
+
+  #define HAS_E4_ENABLE     (PIN_EXISTS(E4_ENABLE))
+  #define HAS_E4_DIR        (PIN_EXISTS(E4_DIR))
+  #define HAS_E4_STEP       (PIN_EXISTS(E4_STEP))
+  #define HAS_E4_MICROSTEPS (PIN_EXISTS(E4_MS1))
+  #define HAS_SOLENOID_4    (PIN_EXISTS(SOL4))
+
+  // Endstops and bed probe
+  #define HAS_X_MIN (PIN_EXISTS(X_MIN) && !IS_Z2_OR_PROBE(X_MIN_PIN))
+  #define HAS_X_MAX (PIN_EXISTS(X_MAX) && !IS_Z2_OR_PROBE(X_MAX_PIN))
+  #define HAS_Y_MIN (PIN_EXISTS(Y_MIN) && !IS_Z2_OR_PROBE(Y_MIN_PIN))
+  #define HAS_Y_MAX (PIN_EXISTS(Y_MAX) && !IS_Z2_OR_PROBE(Y_MAX_PIN))
+  #define HAS_Z_MIN (PIN_EXISTS(Z_MIN) && !IS_Z2_OR_PROBE(Z_MIN_PIN))
+  #define HAS_Z_MAX (PIN_EXISTS(Z_MAX) && !IS_Z2_OR_PROBE(Z_MAX_PIN))
+  #define HAS_Z2_MIN (PIN_EXISTS(Z2_MIN))
+  #define HAS_Z2_MAX (PIN_EXISTS(Z2_MAX))
+  #define HAS_Z_MIN_PROBE_PIN (PIN_EXISTS(Z_MIN_PROBE))
+
+  // Thermistors
   #define HAS_TEMP_0 (PIN_EXISTS(TEMP_0) && TEMP_SENSOR_0 != 0 && TEMP_SENSOR_0 > -2)
   #define HAS_TEMP_1 (PIN_EXISTS(TEMP_1) && TEMP_SENSOR_1 != 0 && TEMP_SENSOR_1 > -2)
   #define HAS_TEMP_2 (PIN_EXISTS(TEMP_2) && TEMP_SENSOR_2 != 0 && TEMP_SENSOR_2 > -2)
   #define HAS_TEMP_3 (PIN_EXISTS(TEMP_3) && TEMP_SENSOR_3 != 0 && TEMP_SENSOR_3 > -2)
   #define HAS_TEMP_4 (PIN_EXISTS(TEMP_4) && TEMP_SENSOR_4 != 0 && TEMP_SENSOR_4 > -2)
+  #define HAS_TEMP_HOTEND (HAS_TEMP_0 || ENABLED(HEATER_0_USES_MAX6675))
   #define HAS_TEMP_BED (PIN_EXISTS(TEMP_BED) && TEMP_SENSOR_BED != 0 && TEMP_SENSOR_BED > -2)
+
+  // Heaters
   #define HAS_HEATER_0 (PIN_EXISTS(HEATER_0))
   #define HAS_HEATER_1 (PIN_EXISTS(HEATER_1))
   #define HAS_HEATER_2 (PIN_EXISTS(HEATER_2))
   #define HAS_HEATER_3 (PIN_EXISTS(HEATER_3))
   #define HAS_HEATER_4 (PIN_EXISTS(HEATER_4))
   #define HAS_HEATER_BED (PIN_EXISTS(HEATER_BED))
+
+  // Thermal protection
+  #define HAS_THERMALLY_PROTECTED_BED (ENABLED(THERMAL_PROTECTION_BED) && HAS_TEMP_BED && HAS_HEATER_BED)
+  #define WATCH_HOTENDS (ENABLED(THERMAL_PROTECTION_HOTENDS) && WATCH_TEMP_PERIOD > 0)
+  #define WATCH_THE_BED (HAS_THERMALLY_PROTECTED_BED && WATCH_BED_TEMP_PERIOD > 0)
+
+  // Auto fans
   #define HAS_AUTO_FAN_0 (PIN_EXISTS(E0_AUTO_FAN))
   #define HAS_AUTO_FAN_1 (HOTENDS > 1 && PIN_EXISTS(E1_AUTO_FAN))
   #define HAS_AUTO_FAN_2 (HOTENDS > 2 && PIN_EXISTS(E2_AUTO_FAN))
@@ -463,87 +545,38 @@
   #define AUTO_4_IS_1 (E4_AUTO_FAN_PIN == E1_AUTO_FAN_PIN)
   #define AUTO_4_IS_2 (E4_AUTO_FAN_PIN == E2_AUTO_FAN_PIN)
   #define AUTO_4_IS_3 (E4_AUTO_FAN_PIN == E3_AUTO_FAN_PIN)
+
+  // Other fans
   #define HAS_FAN0 (PIN_EXISTS(FAN))
   #define HAS_FAN1 (PIN_EXISTS(FAN1) && CONTROLLERFAN_PIN != FAN1_PIN && E0_AUTO_FAN_PIN != FAN1_PIN && E1_AUTO_FAN_PIN != FAN1_PIN && E2_AUTO_FAN_PIN != FAN1_PIN && E3_AUTO_FAN_PIN != FAN1_PIN)
   #define HAS_FAN2 (PIN_EXISTS(FAN2) && CONTROLLERFAN_PIN != FAN2_PIN && E0_AUTO_FAN_PIN != FAN2_PIN && E1_AUTO_FAN_PIN != FAN2_PIN && E2_AUTO_FAN_PIN != FAN2_PIN && E3_AUTO_FAN_PIN != FAN2_PIN)
   #define HAS_CONTROLLERFAN (PIN_EXISTS(CONTROLLERFAN))
+
+  // Servos
   #define HAS_SERVOS (defined(NUM_SERVOS) && NUM_SERVOS > 0)
   #define HAS_SERVO_0 (PIN_EXISTS(SERVO0))
   #define HAS_SERVO_1 (PIN_EXISTS(SERVO1))
   #define HAS_SERVO_2 (PIN_EXISTS(SERVO2))
   #define HAS_SERVO_3 (PIN_EXISTS(SERVO3))
+
+  // Sensors
   #define HAS_FILAMENT_WIDTH_SENSOR (PIN_EXISTS(FILWIDTH))
   #define HAS_FIL_RUNOUT (PIN_EXISTS(FIL_RUNOUT))
+
+  // User Interface
   #define HAS_HOME (PIN_EXISTS(HOME))
   #define HAS_KILL (PIN_EXISTS(KILL))
   #define HAS_SUICIDE (PIN_EXISTS(SUICIDE))
   #define HAS_PHOTOGRAPH (PIN_EXISTS(PHOTOGRAPH))
-  #define HAS_X_MIN (PIN_EXISTS(X_MIN) && !IS_Z2_OR_PROBE(X_MIN_PIN))
-  #define HAS_X_MAX (PIN_EXISTS(X_MAX) && !IS_Z2_OR_PROBE(X_MAX_PIN))
-  #define HAS_Y_MIN (PIN_EXISTS(Y_MIN) && !IS_Z2_OR_PROBE(Y_MIN_PIN))
-  #define HAS_Y_MAX (PIN_EXISTS(Y_MAX) && !IS_Z2_OR_PROBE(Y_MAX_PIN))
-  #define HAS_Z_MIN (PIN_EXISTS(Z_MIN) && !IS_Z2_OR_PROBE(Z_MIN_PIN))
-  #define HAS_Z_MAX (PIN_EXISTS(Z_MAX) && !IS_Z2_OR_PROBE(Z_MAX_PIN))
-  #define HAS_Z2_MIN (PIN_EXISTS(Z2_MIN))
-  #define HAS_Z2_MAX (PIN_EXISTS(Z2_MAX))
-  #define HAS_Z_MIN_PROBE_PIN (PIN_EXISTS(Z_MIN_PROBE))
-  #define HAS_SOLENOID_1 (PIN_EXISTS(SOL1))
-  #define HAS_SOLENOID_2 (PIN_EXISTS(SOL2))
-  #define HAS_SOLENOID_3 (PIN_EXISTS(SOL3))
-  #define HAS_MICROSTEPS_X (PIN_EXISTS(X_MS1))
-  #define HAS_MICROSTEPS_Y (PIN_EXISTS(Y_MS1))
-  #define HAS_MICROSTEPS_Z (PIN_EXISTS(Z_MS1))
-  #define HAS_MICROSTEPS_E0 (PIN_EXISTS(E0_MS1))
-  #define HAS_MICROSTEPS_E1 (PIN_EXISTS(E1_MS1))
-  #define HAS_MICROSTEPS_E2 (PIN_EXISTS(E2_MS1))
-  #define HAS_MICROSTEPS (HAS_MICROSTEPS_X || HAS_MICROSTEPS_Y || HAS_MICROSTEPS_Z || HAS_MICROSTEPS_E0 || HAS_MICROSTEPS_E1 || HAS_MICROSTEPS_E2)
-  #define HAS_STEPPER_RESET (PIN_EXISTS(STEPPER_RESET))
-  #define HAS_X_ENABLE (PIN_EXISTS(X_ENABLE))
-  #define HAS_X2_ENABLE (PIN_EXISTS(X2_ENABLE))
-  #define HAS_Y_ENABLE (PIN_EXISTS(Y_ENABLE))
-  #define HAS_Y2_ENABLE (PIN_EXISTS(Y2_ENABLE))
-  #define HAS_Z_ENABLE (PIN_EXISTS(Z_ENABLE))
-  #define HAS_Z2_ENABLE (PIN_EXISTS(Z2_ENABLE))
-  #define HAS_E0_ENABLE (PIN_EXISTS(E0_ENABLE))
-  #define HAS_E1_ENABLE (PIN_EXISTS(E1_ENABLE))
-  #define HAS_E2_ENABLE (PIN_EXISTS(E2_ENABLE))
-  #define HAS_E3_ENABLE (PIN_EXISTS(E3_ENABLE))
-  #define HAS_E4_ENABLE (PIN_EXISTS(E4_ENABLE))
-  #define HAS_X_DIR (PIN_EXISTS(X_DIR))
-  #define HAS_X2_DIR (PIN_EXISTS(X2_DIR))
-  #define HAS_Y_DIR (PIN_EXISTS(Y_DIR))
-  #define HAS_Y2_DIR (PIN_EXISTS(Y2_DIR))
-  #define HAS_Z_DIR (PIN_EXISTS(Z_DIR))
-  #define HAS_Z2_DIR (PIN_EXISTS(Z2_DIR))
-  #define HAS_E0_DIR (PIN_EXISTS(E0_DIR))
-  #define HAS_E1_DIR (PIN_EXISTS(E1_DIR))
-  #define HAS_E2_DIR (PIN_EXISTS(E2_DIR))
-  #define HAS_E3_DIR (PIN_EXISTS(E3_DIR))
-  #define HAS_E4_DIR (PIN_EXISTS(E4_DIR))
-  #define HAS_X_STEP (PIN_EXISTS(X_STEP))
-  #define HAS_X2_STEP (PIN_EXISTS(X2_STEP))
-  #define HAS_Y_STEP (PIN_EXISTS(Y_STEP))
-  #define HAS_Y2_STEP (PIN_EXISTS(Y2_STEP))
-  #define HAS_Z_STEP (PIN_EXISTS(Z_STEP))
-  #define HAS_Z2_STEP (PIN_EXISTS(Z2_STEP))
-  #define HAS_E0_STEP (PIN_EXISTS(E0_STEP))
-  #define HAS_E1_STEP (PIN_EXISTS(E1_STEP))
-  #define HAS_E2_STEP (PIN_EXISTS(E2_STEP))
-  #define HAS_E3_STEP (PIN_EXISTS(E3_STEP))
-  #define HAS_E4_STEP (PIN_EXISTS(E4_STEP))
-  #define HAS_DIGIPOTSS (PIN_EXISTS(DIGIPOTSS))
   #define HAS_BUZZER (PIN_EXISTS(BEEPER) || ENABLED(LCD_USE_I2C_BUZZER))
   #define HAS_CASE_LIGHT (PIN_EXISTS(CASE_LIGHT))
 
+  // Digital control
+  #define HAS_MICROSTEPS (HAS_X_MICROSTEPS || HAS_Y_MICROSTEPS || HAS_Z_MICROSTEPS || HAS_E0_MICROSTEPS || HAS_E1_MICROSTEPS || HAS_E2_MICROSTEPS || HAS_E3_MICROSTEPS || HAS_E4_MICROSTEPS)
+  #define HAS_STEPPER_RESET (PIN_EXISTS(STEPPER_RESET))
+  #define HAS_DIGIPOTSS (PIN_EXISTS(DIGIPOTSS))
   #define HAS_MOTOR_CURRENT_PWM (PIN_EXISTS(MOTOR_CURRENT_PWM_XY) || PIN_EXISTS(MOTOR_CURRENT_PWM_Z) || PIN_EXISTS(MOTOR_CURRENT_PWM_E))
 
-  #define HAS_TEMP_HOTEND (HAS_TEMP_0 || ENABLED(HEATER_0_USES_MAX6675))
-
-  #define HAS_THERMALLY_PROTECTED_BED (HAS_TEMP_BED && HAS_HEATER_BED && ENABLED(THERMAL_PROTECTION_BED))
-
-  #define WATCH_HOTENDS (ENABLED(THERMAL_PROTECTION_HOTENDS) && WATCH_TEMP_PERIOD > 0)
-  #define WATCH_THE_BED (HAS_THERMALLY_PROTECTED_BED && WATCH_BED_TEMP_PERIOD > 0)
-
   /**
    * This setting is also used by M109 when trying to calculate
    * a ballpark safe margin to prevent wait-forever situation.
diff --git a/Marlin/Configuration.h b/Marlin/Configuration.h
index cc57bff66..0fca8aa5b 100644
--- a/Marlin/Configuration.h
+++ b/Marlin/Configuration.h
@@ -593,6 +593,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/Configuration_adv.h b/Marlin/Configuration_adv.h
index 6c77f907c..e04620dca 100644
--- a/Marlin/Configuration_adv.h
+++ b/Marlin/Configuration_adv.h
@@ -327,7 +327,11 @@
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100
 
-#endif //DUAL_X_CARRIAGE
+#endif // DUAL_X_CARRIAGE
+
+// Activate a solenoid on the active extruder with M380. Disable all with M381.
+// Define SOL0_PIN, SOL1_PIN, etc., for each extruder that has a solenoid.
+//#define EXT_SOLENOID
 
 // @section homing
 
diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 36fcc70c3..2ca660c99 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -963,15 +963,15 @@ void servo_init() {
 
       // This variant uses 3 separate pins for the RGB components.
       // If the pins can do PWM then their intensity will be set.
-      digitalWrite(RGB_LED_R_PIN, r ? HIGH : LOW);
-      digitalWrite(RGB_LED_G_PIN, g ? HIGH : LOW);
-      digitalWrite(RGB_LED_B_PIN, b ? HIGH : LOW);
+      WRITE(RGB_LED_R_PIN, r ? HIGH : LOW);
+      WRITE(RGB_LED_G_PIN, g ? HIGH : LOW);
+      WRITE(RGB_LED_B_PIN, b ? HIGH : LOW);
       analogWrite(RGB_LED_R_PIN, r);
       analogWrite(RGB_LED_G_PIN, g);
       analogWrite(RGB_LED_B_PIN, b);
 
       #if ENABLED(RGBW_LED)
-        digitalWrite(RGB_LED_W_PIN, w ? HIGH : LOW);
+        WRITE(RGB_LED_W_PIN, w ? HIGH : LOW);
         analogWrite(RGB_LED_W_PIN, w);
       #endif
 
@@ -1854,8 +1854,8 @@ static void clean_up_after_endstop_or_probe_move() {
     // Dock sled a bit closer to ensure proper capturing
     do_blocking_move_to_x(X_MAX_POS + SLED_DOCKING_OFFSET - ((stow) ? 1 : 0));
 
-    #if PIN_EXISTS(SLED)
-      digitalWrite(SLED_PIN, !stow); // switch solenoid
+    #if HAS_SOLENOID_1 && DISABLED(EXT_SOLENOID)
+      WRITE(SOL1_PIN, !stow); // switch solenoid
     #endif
   }
 
@@ -2123,7 +2123,13 @@ static void clean_up_after_endstop_or_probe_move() {
                                                      // otherwise an Allen-Key probe can't be stowed.
     #endif
 
-        #if ENABLED(Z_PROBE_SLED)
+        #if ENABLED(SOLENOID_PROBE)
+
+          #if HAS_SOLENOID_1
+            WRITE(SOL1_PIN, deploy);
+          #endif
+
+        #elif ENABLED(Z_PROBE_SLED)
 
           dock_sled(!deploy);
 
@@ -7588,26 +7594,31 @@ inline void gcode_M303() {
 
 #if ENABLED(EXT_SOLENOID)
 
-  void enable_solenoid(uint8_t num) {
+  void enable_solenoid(const uint8_t num) {
     switch (num) {
       case 0:
         OUT_WRITE(SOL0_PIN, HIGH);
         break;
-        #if HAS_SOLENOID_1
+        #if HAS_SOLENOID_1 && EXTRUDERS > 1
           case 1:
             OUT_WRITE(SOL1_PIN, HIGH);
             break;
         #endif
-        #if HAS_SOLENOID_2
+        #if HAS_SOLENOID_2 && EXTRUDERS > 2
           case 2:
             OUT_WRITE(SOL2_PIN, HIGH);
             break;
         #endif
-        #if HAS_SOLENOID_3
+        #if HAS_SOLENOID_3 && EXTRUDERS > 3
           case 3:
             OUT_WRITE(SOL3_PIN, HIGH);
             break;
         #endif
+        #if HAS_SOLENOID_4 && EXTRUDERS > 4
+          case 4:
+            OUT_WRITE(SOL4_PIN, HIGH);
+            break;
+        #endif
       default:
         SERIAL_ECHO_START;
         SERIAL_ECHOLNPGM(MSG_INVALID_SOLENOID);
@@ -7619,9 +7630,18 @@ inline void gcode_M303() {
 
   void disable_all_solenoids() {
     OUT_WRITE(SOL0_PIN, LOW);
-    OUT_WRITE(SOL1_PIN, LOW);
-    OUT_WRITE(SOL2_PIN, LOW);
-    OUT_WRITE(SOL3_PIN, LOW);
+    #if HAS_SOLENOID_1 && EXTRUDERS > 1
+      OUT_WRITE(SOL1_PIN, LOW);
+    #endif
+    #if HAS_SOLENOID_2 && EXTRUDERS > 2
+      OUT_WRITE(SOL2_PIN, LOW);
+    #endif
+    #if HAS_SOLENOID_3 && EXTRUDERS > 3
+      OUT_WRITE(SOL3_PIN, LOW);
+    #endif
+    #if HAS_SOLENOID_4 && EXTRUDERS > 4
+      OUT_WRITE(SOL4_PIN, LOW);
+    #endif
   }
 
   /**
@@ -8548,7 +8568,7 @@ inline void gcode_M907() {
   uint8_t case_light_brightness = 255;
 
   void update_case_light() {
-    digitalWrite(CASE_LIGHT_PIN, case_light_on != INVERT_CASE_LIGHT ? HIGH : LOW);
+    WRITE(CASE_LIGHT_PIN, case_light_on != INVERT_CASE_LIGHT ? HIGH : LOW);
     analogWrite(CASE_LIGHT_PIN, case_light_on != INVERT_CASE_LIGHT ? case_light_brightness : 0);
   }
 
@@ -10739,7 +10759,7 @@ void prepare_move_to_destination() {
       uint8_t speed = (!lastMotorOn || ELAPSED(ms, lastMotorOn + (CONTROLLERFAN_SECS) * 1000UL)) ? 0 : CONTROLLERFAN_SPEED;
 
       // allows digital or PWM fan output to be used (see M42 handling)
-      digitalWrite(CONTROLLERFAN_PIN, speed);
+      WRITE(CONTROLLERFAN_PIN, speed);
       analogWrite(CONTROLLERFAN_PIN, speed);
     }
   }
@@ -11437,9 +11457,9 @@ void setup() {
     dac_init();
   #endif
 
-  #if ENABLED(Z_PROBE_SLED) && PIN_EXISTS(SLED)
-    OUT_WRITE(SLED_PIN, LOW); // turn it off
-  #endif // Z_PROBE_SLED
+  #if (ENABLED(Z_PROBE_SLED) || ENABLED(SOLENOID_PROBE)) && HAS_SOLENOID_1
+    OUT_WRITE(SOL1_PIN, LOW); // turn it off
+  #endif
 
   setup_homepin();
 
@@ -11451,10 +11471,13 @@ void setup() {
     OUT_WRITE(STAT_LED_BLUE_PIN, LOW); // turn it off
   #endif
 
-  #if ENABLED(RGB_LED)
+  #if ENABLED(RGB_LED) || ENABLED(RGBW_LED)
     SET_OUTPUT(RGB_LED_R_PIN);
     SET_OUTPUT(RGB_LED_G_PIN);
     SET_OUTPUT(RGB_LED_B_PIN);
+    #if ENABLED(RGBW_LED)
+      SET_OUTPUT(RGB_LED_W_PIN);
+    #endif
   #endif
 
   lcd_init();
diff --git a/Marlin/SanityCheck.h b/Marlin/SanityCheck.h
index 34b00ceeb..8f4c29542 100644
--- a/Marlin/SanityCheck.h
+++ b/Marlin/SanityCheck.h
@@ -172,6 +172,8 @@
   #error "EXTRUDER_[0123]_AUTO_FAN_PIN is now E[0123]_AUTO_FAN_PIN. Please update your Configuration_adv.h."
 #elif defined(min_software_endstops) || defined(max_software_endstops)
   #error "(min|max)_software_endstops are now (MIN|MAX)_SOFTWARE_ENDSTOPS. Please update your configuration."
+#elif ENABLED(Z_PROBE_SLED) && defined(SLED_PIN)
+  #error "Replace SLED_PIN with SOL1_PIN (applies to both Z_PROBE_SLED and SOLENOID_PROBE)."
 #endif
 
 /**
@@ -459,6 +461,9 @@ static_assert(1 >= 0
   #if ENABLED(Z_PROBE_SLED)
     + 1
   #endif
+  #if ENABLED(SOLENOID_PROBE)
+    + 1
+  #endif
   , "Please enable only one probe: PROBE_MANUALLY, FIX_MOUNTED_PROBE, Z Servo, BLTOUCH, Z_PROBE_ALLEN_KEY, or Z_PROBE_SLED."
 );
 
@@ -472,6 +477,17 @@ static_assert(1 >= 0
     #error "You cannot use Z_PROBE_SLED with DELTA."
   #endif
 
+  /**
+   * SOLENOID_PROBE requirements
+   */
+  #if ENABLED(SOLENOID_PROBE)
+    #if ENABLED(EXT_SOLENOID)
+      #error "SOLENOID_PROBE is incompatible with EXT_SOLENOID."
+    #elif !HAS_SOLENOID_1
+      #error "SOLENOID_PROBE requires SOL1_PIN. It can be added to your Configuration.h."
+    #endif
+  #endif
+
   /**
    * NUM_SERVOS is required for a Z servo probe
    */
diff --git a/Marlin/example_configurations/Cartesio/Configuration.h b/Marlin/example_configurations/Cartesio/Configuration.h
index 6a2382fa4..26fd88412 100644
--- a/Marlin/example_configurations/Cartesio/Configuration.h
+++ b/Marlin/example_configurations/Cartesio/Configuration.h
@@ -592,6 +592,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/Cartesio/Configuration_adv.h b/Marlin/example_configurations/Cartesio/Configuration_adv.h
index 649bf4e86..bfaa39d4c 100644
--- a/Marlin/example_configurations/Cartesio/Configuration_adv.h
+++ b/Marlin/example_configurations/Cartesio/Configuration_adv.h
@@ -327,7 +327,11 @@
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100
 
-#endif //DUAL_X_CARRIAGE
+#endif // DUAL_X_CARRIAGE
+
+// Activate a solenoid on the active extruder with M380. Disable all with M381.
+// Define SOL0_PIN, SOL1_PIN, etc., for each extruder that has a solenoid.
+//#define EXT_SOLENOID
 
 // @section homing
 
diff --git a/Marlin/example_configurations/Felix/Configuration.h b/Marlin/example_configurations/Felix/Configuration.h
index f7cf0e324..2062fc343 100644
--- a/Marlin/example_configurations/Felix/Configuration.h
+++ b/Marlin/example_configurations/Felix/Configuration.h
@@ -576,6 +576,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/Felix/Configuration_adv.h b/Marlin/example_configurations/Felix/Configuration_adv.h
index b470e2f21..3c2610e83 100644
--- a/Marlin/example_configurations/Felix/Configuration_adv.h
+++ b/Marlin/example_configurations/Felix/Configuration_adv.h
@@ -327,7 +327,11 @@
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100
 
-#endif //DUAL_X_CARRIAGE
+#endif // DUAL_X_CARRIAGE
+
+// Activate a solenoid on the active extruder with M380. Disable all with M381.
+// Define SOL0_PIN, SOL1_PIN, etc., for each extruder that has a solenoid.
+//#define EXT_SOLENOID
 
 // @section homing
 
diff --git a/Marlin/example_configurations/Felix/DUAL/Configuration.h b/Marlin/example_configurations/Felix/DUAL/Configuration.h
index 96b9eb19c..45a8ac6b2 100644
--- a/Marlin/example_configurations/Felix/DUAL/Configuration.h
+++ b/Marlin/example_configurations/Felix/DUAL/Configuration.h
@@ -576,6 +576,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/Hephestos/Configuration.h b/Marlin/example_configurations/Hephestos/Configuration.h
index 5488cf6e7..e3a844f8d 100644
--- a/Marlin/example_configurations/Hephestos/Configuration.h
+++ b/Marlin/example_configurations/Hephestos/Configuration.h
@@ -584,6 +584,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/Hephestos/Configuration_adv.h b/Marlin/example_configurations/Hephestos/Configuration_adv.h
index 9aa2652ed..95c0c5c05 100644
--- a/Marlin/example_configurations/Hephestos/Configuration_adv.h
+++ b/Marlin/example_configurations/Hephestos/Configuration_adv.h
@@ -327,7 +327,11 @@
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100
 
-#endif //DUAL_X_CARRIAGE
+#endif // DUAL_X_CARRIAGE
+
+// Activate a solenoid on the active extruder with M380. Disable all with M381.
+// Define SOL0_PIN, SOL1_PIN, etc., for each extruder that has a solenoid.
+//#define EXT_SOLENOID
 
 // @section homing
 
diff --git a/Marlin/example_configurations/Hephestos_2/Configuration.h b/Marlin/example_configurations/Hephestos_2/Configuration.h
index 277bf5364..2b3d2487c 100644
--- a/Marlin/example_configurations/Hephestos_2/Configuration.h
+++ b/Marlin/example_configurations/Hephestos_2/Configuration.h
@@ -587,6 +587,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/Hephestos_2/Configuration_adv.h b/Marlin/example_configurations/Hephestos_2/Configuration_adv.h
index 0d23aa8c0..c5d3f5c6c 100644
--- a/Marlin/example_configurations/Hephestos_2/Configuration_adv.h
+++ b/Marlin/example_configurations/Hephestos_2/Configuration_adv.h
@@ -327,7 +327,11 @@
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100
 
-#endif //DUAL_X_CARRIAGE
+#endif // DUAL_X_CARRIAGE
+
+// Activate a solenoid on the active extruder with M380. Disable all with M381.
+// Define SOL0_PIN, SOL1_PIN, etc., for each extruder that has a solenoid.
+//#define EXT_SOLENOID
 
 // @section homing
 
diff --git a/Marlin/example_configurations/K8200/Configuration.h b/Marlin/example_configurations/K8200/Configuration.h
index be48f771d..cd6e3bf76 100644
--- a/Marlin/example_configurations/K8200/Configuration.h
+++ b/Marlin/example_configurations/K8200/Configuration.h
@@ -622,6 +622,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/K8200/Configuration_adv.h b/Marlin/example_configurations/K8200/Configuration_adv.h
index edf8e4dd4..6616b12bf 100644
--- a/Marlin/example_configurations/K8200/Configuration_adv.h
+++ b/Marlin/example_configurations/K8200/Configuration_adv.h
@@ -340,7 +340,11 @@
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100
 
-#endif //DUAL_X_CARRIAGE
+#endif // DUAL_X_CARRIAGE
+
+// Activate a solenoid on the active extruder with M380. Disable all with M381.
+// Define SOL0_PIN, SOL1_PIN, etc., for each extruder that has a solenoid.
+//#define EXT_SOLENOID
 
 // @section homing
 
diff --git a/Marlin/example_configurations/K8400/Configuration.h b/Marlin/example_configurations/K8400/Configuration.h
index 945659000..07a368c82 100644
--- a/Marlin/example_configurations/K8400/Configuration.h
+++ b/Marlin/example_configurations/K8400/Configuration.h
@@ -593,6 +593,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/K8400/Configuration_adv.h b/Marlin/example_configurations/K8400/Configuration_adv.h
index 0ab0ebdf0..7db7af311 100644
--- a/Marlin/example_configurations/K8400/Configuration_adv.h
+++ b/Marlin/example_configurations/K8400/Configuration_adv.h
@@ -327,7 +327,11 @@
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100
 
-#endif //DUAL_X_CARRIAGE
+#endif // DUAL_X_CARRIAGE
+
+// Activate a solenoid on the active extruder with M380. Disable all with M381.
+// Define SOL0_PIN, SOL1_PIN, etc., for each extruder that has a solenoid.
+//#define EXT_SOLENOID
 
 // @section homing
 
diff --git a/Marlin/example_configurations/K8400/Dual-head/Configuration.h b/Marlin/example_configurations/K8400/Dual-head/Configuration.h
index 4a4d29dc1..43ce27098 100644
--- a/Marlin/example_configurations/K8400/Dual-head/Configuration.h
+++ b/Marlin/example_configurations/K8400/Dual-head/Configuration.h
@@ -593,6 +593,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h b/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
index 6b521ff03..5fbea32d9 100644
--- a/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
+++ b/Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h
@@ -593,6 +593,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/RigidBot/Configuration.h b/Marlin/example_configurations/RigidBot/Configuration.h
index b5b336316..d75440d73 100644
--- a/Marlin/example_configurations/RigidBot/Configuration.h
+++ b/Marlin/example_configurations/RigidBot/Configuration.h
@@ -592,6 +592,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/RigidBot/Configuration_adv.h b/Marlin/example_configurations/RigidBot/Configuration_adv.h
index e1c9e74dd..2badf5188 100644
--- a/Marlin/example_configurations/RigidBot/Configuration_adv.h
+++ b/Marlin/example_configurations/RigidBot/Configuration_adv.h
@@ -327,7 +327,11 @@
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100
 
-#endif //DUAL_X_CARRIAGE
+#endif // DUAL_X_CARRIAGE
+
+// Activate a solenoid on the active extruder with M380. Disable all with M381.
+// Define SOL0_PIN, SOL1_PIN, etc., for each extruder that has a solenoid.
+//#define EXT_SOLENOID
 
 // @section homing
 
diff --git a/Marlin/example_configurations/SCARA/Configuration.h b/Marlin/example_configurations/SCARA/Configuration.h
index b116d9f9a..9b6eb56da 100644
--- a/Marlin/example_configurations/SCARA/Configuration.h
+++ b/Marlin/example_configurations/SCARA/Configuration.h
@@ -608,6 +608,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/SCARA/Configuration_adv.h b/Marlin/example_configurations/SCARA/Configuration_adv.h
index a98ad89af..ba87a8daa 100644
--- a/Marlin/example_configurations/SCARA/Configuration_adv.h
+++ b/Marlin/example_configurations/SCARA/Configuration_adv.h
@@ -327,7 +327,11 @@
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100
 
-#endif //DUAL_X_CARRIAGE
+#endif // DUAL_X_CARRIAGE
+
+// Activate a solenoid on the active extruder with M380. Disable all with M381.
+// Define SOL0_PIN, SOL1_PIN, etc., for each extruder that has a solenoid.
+//#define EXT_SOLENOID
 
 // @section homing
 
diff --git a/Marlin/example_configurations/TAZ4/Configuration.h b/Marlin/example_configurations/TAZ4/Configuration.h
index 4960cf1d5..ab7bb0df6 100644
--- a/Marlin/example_configurations/TAZ4/Configuration.h
+++ b/Marlin/example_configurations/TAZ4/Configuration.h
@@ -613,6 +613,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/TAZ4/Configuration_adv.h b/Marlin/example_configurations/TAZ4/Configuration_adv.h
index 68a12319a..e3fcad981 100644
--- a/Marlin/example_configurations/TAZ4/Configuration_adv.h
+++ b/Marlin/example_configurations/TAZ4/Configuration_adv.h
@@ -335,7 +335,11 @@
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100
 
-#endif //DUAL_X_CARRIAGE
+#endif // DUAL_X_CARRIAGE
+
+// Activate a solenoid on the active extruder with M380. Disable all with M381.
+// Define SOL0_PIN, SOL1_PIN, etc., for each extruder that has a solenoid.
+//#define EXT_SOLENOID
 
 // @section homing
 
diff --git a/Marlin/example_configurations/TinyBoy2/Configuration.h b/Marlin/example_configurations/TinyBoy2/Configuration.h
index 8fce9fa97..6581f6889 100644
--- a/Marlin/example_configurations/TinyBoy2/Configuration.h
+++ b/Marlin/example_configurations/TinyBoy2/Configuration.h
@@ -644,6 +644,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/TinyBoy2/Configuration_adv.h b/Marlin/example_configurations/TinyBoy2/Configuration_adv.h
index 8042ed2e0..4133091a0 100644
--- a/Marlin/example_configurations/TinyBoy2/Configuration_adv.h
+++ b/Marlin/example_configurations/TinyBoy2/Configuration_adv.h
@@ -327,7 +327,11 @@
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100
 
-#endif //DUAL_X_CARRIAGE
+#endif // DUAL_X_CARRIAGE
+
+// Activate a solenoid on the active extruder with M380. Disable all with M381.
+// Define SOL0_PIN, SOL1_PIN, etc., for each extruder that has a solenoid.
+//#define EXT_SOLENOID
 
 // @section homing
 
diff --git a/Marlin/example_configurations/WITBOX/Configuration.h b/Marlin/example_configurations/WITBOX/Configuration.h
index ffa1fe60a..7fa675e8d 100644
--- a/Marlin/example_configurations/WITBOX/Configuration.h
+++ b/Marlin/example_configurations/WITBOX/Configuration.h
@@ -584,6 +584,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/WITBOX/Configuration_adv.h b/Marlin/example_configurations/WITBOX/Configuration_adv.h
index 9aa2652ed..95c0c5c05 100644
--- a/Marlin/example_configurations/WITBOX/Configuration_adv.h
+++ b/Marlin/example_configurations/WITBOX/Configuration_adv.h
@@ -327,7 +327,11 @@
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100
 
-#endif //DUAL_X_CARRIAGE
+#endif // DUAL_X_CARRIAGE
+
+// Activate a solenoid on the active extruder with M380. Disable all with M381.
+// Define SOL0_PIN, SOL1_PIN, etc., for each extruder that has a solenoid.
+//#define EXT_SOLENOID
 
 // @section homing
 
diff --git a/Marlin/example_configurations/adafruit/ST7565/Configuration.h b/Marlin/example_configurations/adafruit/ST7565/Configuration.h
index eaf532eb2..d89067b9b 100644
--- a/Marlin/example_configurations/adafruit/ST7565/Configuration.h
+++ b/Marlin/example_configurations/adafruit/ST7565/Configuration.h
@@ -593,6 +593,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/delta/flsun_kossel_mini/Configuration.h b/Marlin/example_configurations/delta/flsun_kossel_mini/Configuration.h
index d66f45e2f..c8d085fad 100644
--- a/Marlin/example_configurations/delta/flsun_kossel_mini/Configuration.h
+++ b/Marlin/example_configurations/delta/flsun_kossel_mini/Configuration.h
@@ -662,6 +662,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/delta/flsun_kossel_mini/Configuration_adv.h b/Marlin/example_configurations/delta/flsun_kossel_mini/Configuration_adv.h
index a529d6f5a..6faad1510 100644
--- a/Marlin/example_configurations/delta/flsun_kossel_mini/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/flsun_kossel_mini/Configuration_adv.h
@@ -327,7 +327,11 @@
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100
 
-#endif //DUAL_X_CARRIAGE
+#endif // DUAL_X_CARRIAGE
+
+// Activate a solenoid on the active extruder with M380. Disable all with M381.
+// Define SOL0_PIN, SOL1_PIN, etc., for each extruder that has a solenoid.
+//#define EXT_SOLENOID
 
 // @section homing
 
diff --git a/Marlin/example_configurations/delta/generic/Configuration.h b/Marlin/example_configurations/delta/generic/Configuration.h
index 4716101a3..3d088639b 100644
--- a/Marlin/example_configurations/delta/generic/Configuration.h
+++ b/Marlin/example_configurations/delta/generic/Configuration.h
@@ -649,6 +649,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/delta/generic/Configuration_adv.h b/Marlin/example_configurations/delta/generic/Configuration_adv.h
index d06c258dd..b95998e39 100644
--- a/Marlin/example_configurations/delta/generic/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/generic/Configuration_adv.h
@@ -327,7 +327,11 @@
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100
 
-#endif //DUAL_X_CARRIAGE
+#endif // DUAL_X_CARRIAGE
+
+// Activate a solenoid on the active extruder with M380. Disable all with M381.
+// Define SOL0_PIN, SOL1_PIN, etc., for each extruder that has a solenoid.
+//#define EXT_SOLENOID
 
 // @section homing
 
diff --git a/Marlin/example_configurations/delta/kossel_mini/Configuration.h b/Marlin/example_configurations/delta/kossel_mini/Configuration.h
index dd3f38b56..5a47dd758 100644
--- a/Marlin/example_configurations/delta/kossel_mini/Configuration.h
+++ b/Marlin/example_configurations/delta/kossel_mini/Configuration.h
@@ -642,6 +642,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h b/Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h
index d06c258dd..b95998e39 100644
--- a/Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h
@@ -327,7 +327,11 @@
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100
 
-#endif //DUAL_X_CARRIAGE
+#endif // DUAL_X_CARRIAGE
+
+// Activate a solenoid on the active extruder with M380. Disable all with M381.
+// Define SOL0_PIN, SOL1_PIN, etc., for each extruder that has a solenoid.
+//#define EXT_SOLENOID
 
 // @section homing
 
diff --git a/Marlin/example_configurations/delta/kossel_pro/Configuration.h b/Marlin/example_configurations/delta/kossel_pro/Configuration.h
index 78717d428..71f8f62ed 100644
--- a/Marlin/example_configurations/delta/kossel_pro/Configuration.h
+++ b/Marlin/example_configurations/delta/kossel_pro/Configuration.h
@@ -643,6 +643,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h b/Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h
index e7a2485c8..c984b940f 100644
--- a/Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/kossel_pro/Configuration_adv.h
@@ -332,7 +332,11 @@
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100
 
-#endif //DUAL_X_CARRIAGE
+#endif // DUAL_X_CARRIAGE
+
+// Activate a solenoid on the active extruder with M380. Disable all with M381.
+// Define SOL0_PIN, SOL1_PIN, etc., for each extruder that has a solenoid.
+//#define EXT_SOLENOID
 
 // @section homing
 
diff --git a/Marlin/example_configurations/delta/kossel_xl/Configuration.h b/Marlin/example_configurations/delta/kossel_xl/Configuration.h
index 60610f7dc..eb3e3e430 100644
--- a/Marlin/example_configurations/delta/kossel_xl/Configuration.h
+++ b/Marlin/example_configurations/delta/kossel_xl/Configuration.h
@@ -662,6 +662,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h b/Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h
index 492677ea2..d7fb200cb 100644
--- a/Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/kossel_xl/Configuration_adv.h
@@ -327,7 +327,11 @@
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100
 
-#endif //DUAL_X_CARRIAGE
+#endif // DUAL_X_CARRIAGE
+
+// Activate a solenoid on the active extruder with M380. Disable all with M381.
+// Define SOL0_PIN, SOL1_PIN, etc., for each extruder that has a solenoid.
+//#define EXT_SOLENOID
 
 // @section homing
 
diff --git a/Marlin/example_configurations/makibox/Configuration.h b/Marlin/example_configurations/makibox/Configuration.h
index 25090738e..ceb795124 100644
--- a/Marlin/example_configurations/makibox/Configuration.h
+++ b/Marlin/example_configurations/makibox/Configuration.h
@@ -596,6 +596,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/makibox/Configuration_adv.h b/Marlin/example_configurations/makibox/Configuration_adv.h
index a9020e110..c22d6add2 100644
--- a/Marlin/example_configurations/makibox/Configuration_adv.h
+++ b/Marlin/example_configurations/makibox/Configuration_adv.h
@@ -327,7 +327,11 @@
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100
 
-#endif //DUAL_X_CARRIAGE
+#endif // DUAL_X_CARRIAGE
+
+// Activate a solenoid on the active extruder with M380. Disable all with M381.
+// Define SOL0_PIN, SOL1_PIN, etc., for each extruder that has a solenoid.
+//#define EXT_SOLENOID
 
 // @section homing
 
diff --git a/Marlin/example_configurations/tvrrug/Round2/Configuration.h b/Marlin/example_configurations/tvrrug/Round2/Configuration.h
index 9fe6a9160..a6da3cb7a 100644
--- a/Marlin/example_configurations/tvrrug/Round2/Configuration.h
+++ b/Marlin/example_configurations/tvrrug/Round2/Configuration.h
@@ -589,6 +589,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h b/Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h
index d2fe7ae86..c85d848d0 100644
--- a/Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h
+++ b/Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h
@@ -327,7 +327,11 @@
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100
 
-#endif //DUAL_X_CARRIAGE
+#endif // DUAL_X_CARRIAGE
+
+// Activate a solenoid on the active extruder with M380. Disable all with M381.
+// Define SOL0_PIN, SOL1_PIN, etc., for each extruder that has a solenoid.
+//#define EXT_SOLENOID
 
 // @section homing
 
diff --git a/Marlin/example_configurations/wt150/Configuration.h b/Marlin/example_configurations/wt150/Configuration.h
index 83f517fa6..9740a45d7 100644
--- a/Marlin/example_configurations/wt150/Configuration.h
+++ b/Marlin/example_configurations/wt150/Configuration.h
@@ -598,6 +598,9 @@
  *   is enabled then it also applies to Z_PROBE_SPEED_SLOW.
  */
 
+// A probe that is deployed and stowed with a solenoid pin (SOL1_PIN)
+//#define SOLENOID_PROBE
+
 // Enable if you have a Z probe mounted on a sled like those designed by Charles Bell.
 //#define Z_PROBE_SLED
 //#define SLED_DOCKING_OFFSET 5  // The extra distance the X axis must travel to pickup the sled. 0 should be fine but you can push it further if you'd like.
diff --git a/Marlin/example_configurations/wt150/Configuration_adv.h b/Marlin/example_configurations/wt150/Configuration_adv.h
index b64d49152..605eaee93 100644
--- a/Marlin/example_configurations/wt150/Configuration_adv.h
+++ b/Marlin/example_configurations/wt150/Configuration_adv.h
@@ -327,7 +327,11 @@
   // Default x offset in duplication mode (typically set to half print bed width)
   #define DEFAULT_DUPLICATION_X_OFFSET 100
 
-#endif //DUAL_X_CARRIAGE
+#endif // DUAL_X_CARRIAGE
+
+// Activate a solenoid on the active extruder with M380. Disable all with M381.
+// Define SOL0_PIN, SOL1_PIN, etc., for each extruder that has a solenoid.
+//#define EXT_SOLENOID
 
 // @section homing
 
diff --git a/Marlin/pins_MEGATRONICS_3.h b/Marlin/pins_MEGATRONICS_3.h
index cc1c947bd..419f80ba5 100644
--- a/Marlin/pins_MEGATRONICS_3.h
+++ b/Marlin/pins_MEGATRONICS_3.h
@@ -61,8 +61,6 @@
   #define Z_MIN_PROBE_PIN  19
 #endif
 
-#define SLED_PIN           -1
-
 //
 // Steppers
 //
diff --git a/Marlin/pins_RAMBO.h b/Marlin/pins_RAMBO.h
index 828994075..e4df16677 100755
--- a/Marlin/pins_RAMBO.h
+++ b/Marlin/pins_RAMBO.h
@@ -63,10 +63,6 @@
   #define Z_MIN_PROBE_PIN  30
 #endif
 
-#if ENABLED(Z_PROBE_SLED)
-  #define SLED_PIN         -1
-#endif
-
 //
 // Limit Switches
 //
diff --git a/Marlin/pins_RAMPS.h b/Marlin/pins_RAMPS.h
index da14a6dab..767e99085 100644
--- a/Marlin/pins_RAMPS.h
+++ b/Marlin/pins_RAMPS.h
@@ -85,8 +85,6 @@
   #define Z_MIN_PROBE_PIN  32
 #endif
 
-#define SLED_PIN           -1
-
 //
 // Steppers
 //
diff --git a/Marlin/pins_SANGUINOLOLU_11.h b/Marlin/pins_SANGUINOLOLU_11.h
index b7315fba7..62d92b61e 100644
--- a/Marlin/pins_SANGUINOLOLU_11.h
+++ b/Marlin/pins_SANGUINOLOLU_11.h
@@ -41,13 +41,6 @@
 #define Y_STOP_PIN         19
 #define Z_STOP_PIN         20
 
-//
-// Z Probe (when not Z_MIN_PIN)
-//
-#if ENABLED(Z_PROBE_SLED)
-  #define SLED_PIN         -1
-#endif
-
 //
 // Steppers
 //
diff --git a/Marlin/pins_SCOOVO_X9H.h b/Marlin/pins_SCOOVO_X9H.h
index dcb36a24a..a5ef15236 100644
--- a/Marlin/pins_SCOOVO_X9H.h
+++ b/Marlin/pins_SCOOVO_X9H.h
@@ -57,8 +57,6 @@
   #define Z_MIN_PROBE_PIN   30
 #endif
 
-#define SLED_PIN -1
-
 //
 // Steppers
 //
diff --git a/Marlin/stepper.cpp b/Marlin/stepper.cpp
index ed235ca34..11d20251f 100644
--- a/Marlin/stepper.cpp
+++ b/Marlin/stepper.cpp
@@ -1076,6 +1076,9 @@ void Stepper::init() {
   #if HAS_E3_STEP
     E_AXIS_INIT(3);
   #endif
+  #if HAS_E4_STEP
+    E_AXIS_INIT(4);
+  #endif
 
   // waveform generation = 0100 = CTC
   CBI(TCCR1B, WGM13);
@@ -1461,22 +1464,34 @@ void Stepper::report_positions() {
   void Stepper::microstep_init() {
     SET_OUTPUT(X_MS1_PIN);
     SET_OUTPUT(X_MS2_PIN);
-    #if HAS_MICROSTEPS_Y
+    #if HAS_Y_MICROSTEPS
       SET_OUTPUT(Y_MS1_PIN);
       SET_OUTPUT(Y_MS2_PIN);
     #endif
-    #if HAS_MICROSTEPS_Z
+    #if HAS_Z_MICROSTEPS
       SET_OUTPUT(Z_MS1_PIN);
       SET_OUTPUT(Z_MS2_PIN);
     #endif
-    #if HAS_MICROSTEPS_E0
+    #if HAS_E0_MICROSTEPS
       SET_OUTPUT(E0_MS1_PIN);
       SET_OUTPUT(E0_MS2_PIN);
     #endif
-    #if HAS_MICROSTEPS_E1
+    #if HAS_E1_MICROSTEPS
       SET_OUTPUT(E1_MS1_PIN);
       SET_OUTPUT(E1_MS2_PIN);
     #endif
+    #if HAS_E2_MICROSTEPS
+      SET_OUTPUT(E2_MS1_PIN);
+      SET_OUTPUT(E2_MS2_PIN);
+    #endif
+    #if HAS_E3_MICROSTEPS
+      SET_OUTPUT(E3_MS1_PIN);
+      SET_OUTPUT(E3_MS2_PIN);
+    #endif
+    #if HAS_E4_MICROSTEPS
+      SET_OUTPUT(E4_MS1_PIN);
+      SET_OUTPUT(E4_MS2_PIN);
+    #endif
     static const uint8_t microstep_modes[] = MICROSTEP_MODES;
     for (uint16_t i = 0; i < COUNT(microstep_modes); i++)
       microstep_mode(i, microstep_modes[i]);
@@ -1484,33 +1499,51 @@ void Stepper::report_positions() {
 
   void Stepper::microstep_ms(uint8_t driver, int8_t ms1, int8_t ms2) {
     if (ms1 >= 0) switch (driver) {
-      case 0: digitalWrite(X_MS1_PIN, ms1); break;
-      #if HAS_MICROSTEPS_Y
-        case 1: digitalWrite(Y_MS1_PIN, ms1); break;
+      case 0: WRITE(X_MS1_PIN, ms1); break;
+      #if HAS_Y_MICROSTEPS
+        case 1: WRITE(Y_MS1_PIN, ms1); break;
       #endif
-      #if HAS_MICROSTEPS_Z
-        case 2: digitalWrite(Z_MS1_PIN, ms1); break;
+      #if HAS_Z_MICROSTEPS
+        case 2: WRITE(Z_MS1_PIN, ms1); break;
       #endif
-      #if HAS_MICROSTEPS_E0
-        case 3: digitalWrite(E0_MS1_PIN, ms1); break;
+      #if HAS_E0_MICROSTEPS
+        case 3: WRITE(E0_MS1_PIN, ms1); break;
       #endif
-      #if HAS_MICROSTEPS_E1
-        case 4: digitalWrite(E1_MS1_PIN, ms1); break;
+      #if HAS_E1_MICROSTEPS
+        case 4: WRITE(E1_MS1_PIN, ms1); break;
+      #endif
+      #if HAS_E2_MICROSTEPS
+        case 5: WRITE(E2_MS1_PIN, ms1); break;
+      #endif
+      #if HAS_E3_MICROSTEPS
+        case 6: WRITE(E3_MS1_PIN, ms1); break;
+      #endif
+      #if HAS_E4_MICROSTEPS
+        case 7: WRITE(E4_MS1_PIN, ms1); break;
       #endif
     }
     if (ms2 >= 0) switch (driver) {
-      case 0: digitalWrite(X_MS2_PIN, ms2); break;
-      #if HAS_MICROSTEPS_Y
-        case 1: digitalWrite(Y_MS2_PIN, ms2); break;
+      case 0: WRITE(X_MS2_PIN, ms2); break;
+      #if HAS_Y_MICROSTEPS
+        case 1: WRITE(Y_MS2_PIN, ms2); break;
       #endif
-      #if HAS_MICROSTEPS_Z
-        case 2: digitalWrite(Z_MS2_PIN, ms2); break;
+      #if HAS_Z_MICROSTEPS
+        case 2: WRITE(Z_MS2_PIN, ms2); break;
       #endif
-      #if HAS_MICROSTEPS_E0
-        case 3: digitalWrite(E0_MS2_PIN, ms2); break;
+      #if HAS_E0_MICROSTEPS
+        case 3: WRITE(E0_MS2_PIN, ms2); break;
       #endif
-      #if HAS_MICROSTEPS_E1
-        case 4: digitalWrite(E1_MS2_PIN, ms2); break;
+      #if HAS_E1_MICROSTEPS
+        case 4: WRITE(E1_MS2_PIN, ms2); break;
+      #endif
+      #if HAS_E2_MICROSTEPS
+        case 5: WRITE(E2_MS2_PIN, ms2); break;
+      #endif
+      #if HAS_E3_MICROSTEPS
+        case 6: WRITE(E3_MS2_PIN, ms2); break;
+      #endif
+      #if HAS_E4_MICROSTEPS
+        case 7: WRITE(E4_MS2_PIN, ms2); break;
       #endif
     }
   }
@@ -1530,26 +1563,41 @@ void Stepper::report_positions() {
     SERIAL_PROTOCOLPGM("X: ");
     SERIAL_PROTOCOL(READ(X_MS1_PIN));
     SERIAL_PROTOCOLLN(READ(X_MS2_PIN));
-    #if HAS_MICROSTEPS_Y
+    #if HAS_Y_MICROSTEPS
       SERIAL_PROTOCOLPGM("Y: ");
       SERIAL_PROTOCOL(READ(Y_MS1_PIN));
       SERIAL_PROTOCOLLN(READ(Y_MS2_PIN));
     #endif
-    #if HAS_MICROSTEPS_Z
+    #if HAS_Z_MICROSTEPS
       SERIAL_PROTOCOLPGM("Z: ");
       SERIAL_PROTOCOL(READ(Z_MS1_PIN));
       SERIAL_PROTOCOLLN(READ(Z_MS2_PIN));
     #endif
-    #if HAS_MICROSTEPS_E0
+    #if HAS_E0_MICROSTEPS
       SERIAL_PROTOCOLPGM("E0: ");
       SERIAL_PROTOCOL(READ(E0_MS1_PIN));
       SERIAL_PROTOCOLLN(READ(E0_MS2_PIN));
     #endif
-    #if HAS_MICROSTEPS_E1
+    #if HAS_E1_MICROSTEPS
       SERIAL_PROTOCOLPGM("E1: ");
       SERIAL_PROTOCOL(READ(E1_MS1_PIN));
       SERIAL_PROTOCOLLN(READ(E1_MS2_PIN));
     #endif
+    #if HAS_E2_MICROSTEPS
+      SERIAL_PROTOCOLPGM("E2: ");
+      SERIAL_PROTOCOL(READ(E2_MS1_PIN));
+      SERIAL_PROTOCOLLN(READ(E2_MS2_PIN));
+    #endif
+    #if HAS_E3_MICROSTEPS
+      SERIAL_PROTOCOLPGM("E3: ");
+      SERIAL_PROTOCOL(READ(E3_MS1_PIN));
+      SERIAL_PROTOCOLLN(READ(E3_MS2_PIN));
+    #endif
+    #if HAS_E4_MICROSTEPS
+      SERIAL_PROTOCOLPGM("E4: ");
+      SERIAL_PROTOCOL(READ(E4_MS1_PIN));
+      SERIAL_PROTOCOLLN(READ(E4_MS2_PIN));
+    #endif
   }
 
 #endif // HAS_MICROSTEPS
diff --git a/Marlin/thermistortables.h b/Marlin/thermistortables.h
index 05ec9a30a..3777cf2e4 100644
--- a/Marlin/thermistortables.h
+++ b/Marlin/thermistortables.h
@@ -226,6 +226,15 @@
     #define HEATER_3_RAW_LO_TEMP 0
   #endif
 #endif
+#ifndef HEATER_4_RAW_HI_TEMP
+  #ifdef HEATER_4_USES_THERMISTOR
+    #define HEATER_4_RAW_HI_TEMP 0
+    #define HEATER_4_RAW_LO_TEMP 16383
+  #else
+    #define HEATER_4_RAW_HI_TEMP 16383
+    #define HEATER_4_RAW_LO_TEMP 0
+  #endif
+#endif
 #ifndef HEATER_BED_RAW_HI_TEMP
   #ifdef BED_USES_THERMISTOR
     #define HEATER_BED_RAW_HI_TEMP 0