If you are [Tech Build] you go all MacGyver on an old printer and pull out a stepper motor. How does a stepper motor turn into an encoder ... Of course, an Arduino reads the pulses.

Together, this handful of parts provide all that is needed to read the encoder ... on the ‘stepper motor driver’ interface pins hooked up to the motion controller upstream. The Arduino ...

grbl is stepper motor controller firmware for three-axis cnc machines ... that are too powerful for the normal drivers included on grbl Arduino shields (or integrated Arduino+drivers equivalents), and ...