Alright, I may be losing my mind. For weeks I’ve used grbl panel’s Z-probe to happily help zero my zaxis against my work (along with the clips on the probe headers, obviously).
Suddenly this morning, probing goes backwards. The Z axis travels up. Nothing has changed in my setup. Sometimes, after manually zeroing Z and running a job, Z probing will start going in the right direction again. The behavior can be repeated by sending the manual zeroing command to grbl directly as well.
Any brilliant ideas on what I’m missing here?