Fully 3D Printed Small CNC Router/Plotter

This Thing began as an effort to build a small, cheap CNC machine. I mainly wanted to gain some experience with the electronics and control software without spending several hundred dollars on components. For control it uses clones of an Arduino Uno and CNC V3 shield. Steppers are the ultra cheap 28BYJ-48's with the bipolar hack. The drive system is GT2 pulleys with belts glued to the linear rails used as a rack and pinion gear drive to reduce moving parts. For a spindle I would try the tiny HF Drillmaster Rotary Tool (see edit below). I did not want to buy rods or extrusions for the frame so all the other parts including linear rails would be 3D printed. Plus all the parts had to fit on the 6"x 6" print bed of the Lulzbot Mini.

This is what I ended up with. It is fairly small but still has 7"x 7"x 1.5 (177 x 177 x 40 mm) of travel with about 18" x 20" overall size. It was fairly cheap (by CNC standards anyway). It cost about $90.00 in purchased parts, plus whatever it