Interesting idea about the screw. Depending on arrangement, it could impede on the work envelope but I think that can be addressed. (I only worry about backlash.) I think it is a very workable idea. I am going to experiment with the belt/string drive to see if it is feasible. Speed is more important to me than small steppers. In fact, the Nema17 motors are 15% cheaper than the Nema14 ones I wanted.
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