@blt3dp said in My delta forgot how to delta - 4th axis:

Is there anything odd in your config-override.g?

I feel embarrassed now, I forgot there's an M665 in there, doh. Stuff works as expected now.

To home it, you could pass the cable through a hole or slot in a plate or a printed part at the top of the printer, and have a knot or collet on the cable below that. Then either use a microswitch to detect when the knot pushes against the plate, or use stall detection.