X and Y move, Z dosen't move, limits won't trip. (4 replies)

Hi everyone,

New problem today... I have X and Y moving nice but the Z axis just jumps back and forth/ chatters when I try to move it in Pronterface, the extruder motor seems to be working nice too, it moves 5mm filament in when I click on the "extrude" 5mm in Pronterface. When I try to move X or Y and I trip the opto nothing changes, the bed or extruder will just keep moving.

I've tried another step-stick in place of another for the z motor and same problem, this is the Sanguinololu rev 1.3 with two headers, but I'm only using one, do I need to use both?

Thanks in advance for any and all help,

Rob