Howdy howdy,
I am working on a pen plotter type device that uses a rack and pinion for my Z Axis (that moves the pen on and off the surface). I've been trying to use the sensorless homing to touch off the surface with the pen, but having issues. I have set up the X and Y axis properly, adjusted their sensitivity and validated that they work on my BTT skr mini E3, but when I try to use the Z Axis, it simply moves ~5-6mm and then stops. The travel seems to stay the same regardless of there it starts, so it doesn't seem to be a spike in current. I've tried the bare motor in both the Y Axis pins and the Z axis pins, and it seems to work just fine on the Y Axis.
My question: Is there something in the Marlin firmware that would be causing the behaviour to be different with the Z Axis compared to the Y and X Axis? I've combed through the config and adv config, but am worried I am missing something that has implications for how the homing sequence is run for the Z Axis.
Thanks much for any leads!