probably such a lame problem, but i have only just received my stepper motors, and i have a grbl cnc shield. my x and y are fine but my z only goes in one direction even if i jog in both directions. The display shows it going in both directions?
This is most likely a loose wire to the shield. It could also be internal. Switch the x motor with the z and see if the problem persists.
Thanks for you input, i switched the x and y motor, and it looks like the motor is fine and functional. I also swapped the sticks around but had same problem. I then used the additional slot and cloned the z axis with the jumpers and the cloned z is working fine now. So problem kinda solved at the moment until i need the extra slot.