Test pulley set screws, making sure they are tightened all they way
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Re-tighten if loose. If this occurs often, consider using thread locker (such as Loctite) to prevent the set screws from coming un-done.
Test belt tension, it should be taught but not overly so
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Follow the belt assembly instructions to reset the belt
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Reposition Z-Axis stepper motor to adjust belt tension
Associated Symptoms
- Depth is wrong