Reply To: 2.5 ft^2 build coming along

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I tried carving some wood today. It seemed to start off okay but then it randomly started dropping my Z axis. I killed the job, reset everything, and ran it again. It dropped the Z axis again, but at a different point. It’s not something in the g-code telling it to do this. Could it be a driver overheating issue? I have a multimeter and I can 3d print a plastic screwdriver for adjusting the voltage. Any idea what I should set it to? These are the motors I am using:

Having never done this before I’m not quite sure how to proceed. Turning the screw is straight forward enough, but where should I be measuring the voltage to see the result? As always your help is much appreciated, thank you!