I’m sure that this was working before, and now… I don’t know what’s wrong.
I’ve been trying to work out things with my LR2, trying to square the endstops. THe process has been going like this: Fire up the LR2, draw a square, then home the Y axis. Adjust the endstops as necessary, rinse and repeat.
Last time I was trying to fine-tune things, (It’s super close, but I think it could be better) when I home either the X or Y axis (Or both) with G28X G28Y or G28XY it lowers the Z axis until it crashes into the table and threatens to stretch the Z couplers. One of the Z couplers wobbles a little when it moves now. It works as expected if I home everything (G28) by homing the Z to the top of travel, then homing X, and last Y. Of course, I don’t WANT to home Z most of the time, since I only really want to do that once in order to level the Z screws. Going to the top of travel takes a long time. Not a big deal if I’m only doing it once, but troublesome for something like this where I’m doing it often.
No idea why it’s trying to LOWER the Z axis as part of the homing operation.
The only thing that I’ve changed since I’m sure that this was working is plugging in the Z probe, but behaviour doesn’t change if I disconnect it.
I wonder if it has anything to do with absolute/relative mode, since Marlin generally raises the Z axis before homing X and Y. I don’t know why homing Z would change that, unless it specifically traps a homed Z because Z is already at maximum.
For the time being, I can deal with it. I need to take apart the sled and put in countersunk screws anyway.