From 1ec9953e7e1cb534832de6257c5486d20326c790 Mon Sep 17 00:00:00 2001 From: ushills Date: Sat, 4 May 2019 22:28:23 +0000 Subject: [PATCH] Update I3 Pro B calibration routine (#13907) --- .../examples/Geeetech/Prusa i3 Pro B/README.md | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/config/examples/Geeetech/Prusa i3 Pro B/README.md b/config/examples/Geeetech/Prusa i3 Pro B/README.md index ffb274cac..30fcf2e44 100644 --- a/config/examples/Geeetech/Prusa i3 Pro B/README.md +++ b/config/examples/Geeetech/Prusa i3 Pro B/README.md @@ -36,4 +36,19 @@ The skew factor must be adjusted for each printer: - Print a suitable mount to attach the sensor to the printer. The example configuration file is adjusted to http://www.geeetech.com/wiki/images/6/61/3DTouch_auto_leveling_sensor-1.zip - Unlike suggested in [geeetech.com/wiki/index.php/3DTouch_Auto_Leveling_Sensor](https://www.geeetech.com/wiki/index.php/3DTouch_Auto_Leveling_Sensor), the existing end stop switch is expected to be kept connected to Z_MIN. So, the sensor is to be connected to Z_MAX, according to Marlin's default settings. Furthermore, GT2560-A+ provides a connector for the servo next to thermistor connectors (see [GT2560](https://www.geeetech.com/wiki/images/thumb/4/45/GT2560_wiring.jpg/700px-GT2560_wiring.jpg) and [GT2560-A+](http://i.imgur.com/E0t34VU.png)). - Be careful to respect the polarity of the sensor when connecting it to the GT2560-A+. Unlike end stops, reversing the connection will prevent the sensor from working properly. -- [Test](http://www.geeetech.com/wiki/index.php/3DTouch_Auto_Leveling_Sensor#Testing) and [calibrate](https://www.geeetech.com/wiki/index.php/3DTouch_Auto_Leveling_Sensor#Calibration) the sensor. \ No newline at end of file +- [Test](http://www.geeetech.com/wiki/index.php/3DTouch_Auto_Leveling_Sensor#Testing) and [calibrate](https://www.geeetech.com/wiki/index.php/3DTouch_Auto_Leveling_Sensor#Calibration) the sensor. +- If using the GT2560-A+ and with the sensor connected to Z_MAX and an endstop connected to Z_MIN use the following calibration routine instead. + +## 3DTouch Calibration with Z_MAX + +- Home the printer with `G28` command. +- Disable the Z axis software endstop with `M211 S0 Z0` +- Reset the probe Z_OFFSET with `M851 Z0` +- Move to the center of the bed with `G1 X100 Y100` +- Move Z incrementally until the nozzle is the correct height from the bed using a shim or piece of paper, record this Z movement, for example -0.2. +- Do a single probe at the current point in the middle of the bed using `G30` and not the returned value, for example 1.9. Invert this value, i.e. -1.9, and add it to the Z offset above, i.e. -0.2 in this example giving -2.1. +- Update the probe Z_OFFSET to this value using `M851` i.e. `M851 Z-2.1`. +- Re-enable software end-stops with `M211 S1 Z0` +- Save this value to the EEPROM with `M500`. +- Update the start G-Code in your slicer software to insert a `G29` after the last `G28`. +- Carefully test that the offset is correct in the first print.