I am having a lot of trouble calibrating my 28cm printer. When I get down to around 282mm and hit the '+' I just hear a soft clunk sound and there is no movement. The height indicator in the software increases, so it thinks it moved, but since it didn't things are out of synch at this point. I am wondering if somehow raising the platform with some washers, or maybe by stacking 2 of them on top of each other might be the solution here. Has anyone else run into this?
You may need to loosen(not remove) the 3 big screw on the right side of the Z axis, and slide the entire Z axis downward for a few mm.
I ended up raising the platform slightly with a couple of washers:
