Quote Originally Posted by Snowtech View Post
Well, if the DM542 drivers are already built into two different machines, my suggestion might be more work.

What you need to do it the way you described would be a 4p2t (4 poles, 2 throw) switch or relay.
This can switch the 4 wires of the stepper between 2 sources, but the switch has to be rated for the full current of the steppers.

Jan
You will have a good chance of blowing the drive if you switch if you switch it live