Thank you so much. I was thinking that the problem was #define Z_HOMING_HEIGHT 4 (on your first link). The problem is surely connected to that line, because (as in the code) "Minimal z height before homing (G28) for Z". In fact if the Z heigh is 0 the printer move the Z down of 4 mm and then home the X or Y axis. Sorry if this solution has been posted before, I couldn't find it. I just recently got an Ender 5 Pro for Christmas as many others have, set up went okay. No BLTouch but the 4.x silent board. When I select auto home, the z axis drops a little, the x and y go to the back right corner as they should, but then the z just just drops a little more Z axis homing with bltouch sensor is not working properly. Replaced a dead SKR minie3 V1.3 board with a new V.2 board. the BLtouch does it's little dance test, and I can trigger testing through the touch panel. I can 'drive' all axis through the touch panel properly. When I tell the printer to home, the X and Y axis home properly, but the Z After looking into the pin layout for the board I saw the following: #elif EXTRUDERS <= 2 // Hijack the last extruder so that we can get the PWM signal off the Y breakout // Move Y to the E2 plug. This makes dual Y steppers harder. This prompted me to move the stepper driver and the motor cable to the E2 connector on the board. Sensorless homing requires a setup routine or at least be configured to work and it deliberately has not been done for the Z axis. The reason being that Z axis can have a very large torque multiplier with the screw ratios and when you ram you nozzle into the heat bed, the motors may not see much resisting force. I did not want people to start I was eventually able to get a mostly working config but now have an issue with auto homing on the Y axis. When I select auto home from the Marlin menu, the hot end will move to the right to home X as usual, but then when it moves towards the back to home Y it will sometimes not make it all the way to the end stop at the back right of the printer. Setting stall sensitivity to various intermediate values. Increasing homing speed. Enabling/disabling HOME_Y_BEFORE_X. Enabling/disabling QUICK_HOME. Enabling/disabling IMPROVE_HOMING_RELIABILITY. Install Marlin 2.0.9.2 with TMC2209 drivers. Enable sensorless homing. Compile and upload the firmware. Send G28. I tried running STEPPER_BUZZ STEPPER=stepper_x and the same for the Y axis, but it doesn't look like anything is happening. I am more or less sure this is a software problem, since the printer works just fine with Marlin but I never had this problem with Klipper before I replaced the motherboard. Bgnome • 4 yr. ago. The BLTouch should not retract on a homing move. It should do a self test on a boot. It is possible that the magnet in the BLTouch is too close to the set screw, causing an automatic retraction. With the pin retracted, try backing out the set screw until the pin drops, then tighten it a bit so that the pin won't drop on it I have a printer with a v3.1 BLTouch and a BTT SKR mini E3 V3 and I can't get the BLTouch to work as a probe while homing. I have tried both of the images provided here and both cause the BLTouch to deploy properly but when I autohome and it gets to Z the BLtouch deploys (turns white) but the z axis doesn't move.. I found this thread which provides an image that does work but not much about rCtw.