TL;DR
Görkem Bozkurt has created an open-source modification for the LEGO Orrery, which is a model that illustrates the positions of celestial bodies in the solar system. This mod features a custom printed circuit board (PCB) that can be directly affixed to a NEMA17 stepper motor. By replacing the manual crank with this setup, users can control the Orrery’s movement with ease, only needing to remove five LEGO pieces to install it.