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That was indeed the issue; one of the grub screws holding the leadscrew had backed out. Tightening it fixed the issue and I could finish my first carving. Thanks.

There seems to still be some...

When trying out the GRBLpanel tutorial I encountered a problem with the Z-axis gantry getting stuck. When jogging it would seize with the screw not turning. Jogging it back and forward again would...