From 4338813814b81443881a612b28f2cd78eed6d0c8 Mon Sep 17 00:00:00 2001
From: Alexander Leisentritt <alexander.leisentritt@alitecs.de>
Date: Tue, 15 Mar 2016 23:03:59 +0100
Subject: [PATCH] save last extruder and set stepper directions too in case the
 extruder changed fixes MarlinFirmware/Marlin#3144 and
 MarlinFirmware/Marlin#3083

---
 Marlin/stepper.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Marlin/stepper.cpp b/Marlin/stepper.cpp
index 76300ac92..72ee0dfa9 100644
--- a/Marlin/stepper.cpp
+++ b/Marlin/stepper.cpp
@@ -574,8 +574,11 @@ void set_stepper_direction() {
 // block begins.
 FORCE_INLINE void trapezoid_generator_reset() {
 
-  if (current_block->direction_bits != out_bits) {
+  static int8_t last_extruder = -1;
+
+  if (current_block->direction_bits != out_bits || current_block->active_extruder != last_extruder) {
     out_bits = current_block->direction_bits;
+    last_extruder = current_block->active_extruder;
     set_stepper_direction();
   }