If we told you somebody built a 3D printed go-kart, you’d expect to see a certain sequence of events. A bit of work in CAD, a printer montage, then some assembly. That’s not the case here.

But some 3D printed pulleys and a very simple ... pen off the sheet. Of course, the pen or the servo horn slides across the paper, so we don’t think you could easily hang a laser module to make ...