Possible causes:
- Motor power
- Dirty rods that need oil (worked wonders for my machine after lots of moving)
- Axes are not square (was the problem with most machines that came back from NY makerfair)
- Small belts are jumping over pullies, but you'll get bad prints before this.
- A Tesla-coil on the same power strip.
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IRobertI 521
I'd turn them up a bit. I think I remember you saying that your motors were completely cool after you turned them down? Stepper motors do get hot and that's completely normal and expected. I seem to remember seeing that 85C is a quite common rating on stepper motors. So, if you can still touch the motor without getting scorched I think you're just fine. Of course there's no reason to run them hotter than necessary though.
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