Z stepper motor problem

[cropwell]

Hi Terry, This sounds exactly the same as the problem I had. Mine turned out to be a broken cable in the Z. It was making contact every now and then. Have you test driven the Z axis from another socket ?

These problems can be a bugger to find. My Z axis had a preponderance to go downwards and the job it happened first on was ruined and the cutter went on to gouge the bed afore I could get to the 'Oh Shite' button.

In the end I made a join with a connector that was fixed to the Z axis so there was no movement of the wires coming out of the stepper. My 3D printer has gone through 2 stepper cables on the only axis where the cable moves significantly. The breaks were internal in the wires and first time difficult to find. Second time I just replaced the cable at the first sign of failure.

Best of luck with your fault finding.

Cheers,

Rob