[Alpha le ciel] is building this stepper motor module as the first of many Raspberry ... really whatever you want. A stepper driver that conforms to the footprint of the Pi Zero is a good start ...

At first glance, [Dean Gouramanis]’s stepper driver module for 3D printers looks like just another RAMPS-compatible stepper board. Except, what could that gold-plated copper peg sticking out of ...