Can I a spin stepper motor by hand without damaging the driver

As others have stated it really depends on your electronics. If you have a breakout board and it can block the back flow of electricity or is isolated you'll have no issues. Additionally your driver may be capable of doing the same. I'd check the specs of these and they should answer your question.
 
Wow thanks for all the feedback, I think I'll have to do some research before choosing. But on a side note, my nema is quite stiff with nothing connected and the phases not shorted together, is this normal, and if i can can I reduce it
 
Assuming you are not connected to the driver, That’s the cogging torque of the motor. You cannot reduce it. It is a physical characteristic of the motor
 
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