Reprap - motors

The stepper motors are NEMA 17 motors. Five are required for a Prusa Mendel Reprap - one for the X axis, Y axis and extruder, and two for the Z axis.

I am using the Stepstick stepper drivers (they're essentially open-source clones of the popular Pololu stepper drivers). For certain firmwares (maybe all), there is a configuration parameter which defines the steps per m for each axis as well as for the extruder. It can be tricky to figure this out - as it depends on a number of parameters (the stepping angle of your stepper motor, the number of teeth on the pulley, the pitch of your threaded rod, etc.). I wrote a MATLAB script to make it easier.