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Ah, Im not quite using the same command. Turns out 100mm/minute (F100) is imperceptibly slow over the range of about 1mm... Fixed that in printer settings, all is well.

Issuing a G0 Z300 F3500 (or G1 Z100 F3500 or similar) works fine. I just cant use the manual Z-axis arrows in the Repetier-Host software. I suppose I can try to work around that, but Im curious a) why that doesnt work (when I hit echo on, it is issuing the same command I do basically: G91, G1 Z-1.00 ...

So, new Rostock MAX. Got all three stepper motors working, and running G28 has them all happily walk up to my end stops and stop. So I know I can run all three motors at once and have it work. But when I go in to the manual control, and try to adjust the Z axis at all, something near my Rambo board ...

Indeed, I got those, but the resolution isnt great, and so I didnt see the difference in threading, especially since I dont have the actual M3s to compare. Or didnt anyway. Once you have the #4 x 3/8ths and the M3x10mm Ls side by side, its pretty obvious which is which. That said, I wonder if labels ...

Thanks cambo3d, that certainly would explain why they wont catch. Unfortunately I simply dont have any other screws that even come close to the right size. Off to the hardware store.

This is what I got:

Thanks for this picture, helped me find these screws as well. Unfortunately, the problem Im having is that these screws are like... 1mm too short to actually bind to the stepper motors through the board. Before I go buying longer screws and trying to cut them to the right size, is there something I ...