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If you could squeeze in a rotor encoder between the motor and gearbox, this would make the unit more usable as a substitute for a stepper motor. I picture a flat reprapped disk with cut out areas that would let light pass from an LED to a photocell.

If you could divide the rotation into 8 readable positions going in, that would give you a 512 position output, which would be slightly better than the 200-step steppers (400 half steps) that some repraps are using. Question is, would it match the stepper's speed?