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I wish all it did was stop working and miss a few steps – it was somehow causing the whole Arduino to completely restart in the middle of jobs somehow.
I got out my multimeter and it tests at 600mV, and I noticed an odd thing. If it’s being powered by the 12V power the driver isn’t heating up – once I connect over USB it starts heating up very quickly. How could a stepper go bad in a way that the 12V doesn’t cause a problem but USB does?