In fact, if you’ve got a 3D-printer, it can be remarkably straightforward, as [Maker 101] demonstrates. The build relies on an Arduino Uno as the brains. It’s equipped with an L293D motor ...

By harnessing the power of 3D printing ... design files or print the arm as-is Follow clear instructions for wiring and securing components during assembly The Arduino Uno serves as the control ...

Though composed of 3D printed parts, the railgun design isn't something most people can pick up and run with. "The railgun's electronics are based around an Arduino Uno R3 [circuit board] which ...