[Connor] and [Feiran] decided to do the hacker version of a PCB printer: an old HP plotter converted to modern hardware with a web interface with a conductive ink pen. The plotter in question is ...

In fact, if your 3D printed parts look good enough, this could probably pass for a commercial product. For the electronics, the plotter uses an Arduino Uno and a matching CNC Shield. Two NEMA 17 ...