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This proudtc is awesome! It comes well-packed, with plenty of protection. and this stepper driver works well with standard bi-polar stepper motor. I connect it directly to a NEMA-23 stepper motor in the Y axis of my 3D printer, it operates perfectly, I power the stepper motor with a 32V supply with current set at 2A and this driver barely gets warm, I plan to buy 2 more soon.