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It sounds like the stepper doesn’t have adequate power to break inertia (get moving), but once started, it can move. That could be some form of obstruction or the current going to the stepper
If you have a multimeter, you can use that to check and set the current. @LarryM has a great post on that here:
It is mentioned in Larry’s post, but @RobertA_Rieke has an excellent video showing an easy way to adjust the potentiometers without a multimeter here:
