Robo Pen Plotter

thingiverse

This plotter works perfectly with the stock Robo 3D printer. The plotter holder folds down neatly when printing tall objects. You can see how it's done in this video: https://www.youtube.com/watch?v=i9zJe2K_120 To set up your plotter, you will need a M3x12 or M3x15 screw that matches the existing NEMA 17 motor on your printer. For the pen, use a Pilot G2 Gel ballpoint and take the spring from it. Then, place the spring into the opening where the pen ink cartridge fits. Be prepared to drill out the opening if your printer's accuracy requires it. As an added tip, you can also find affordable gel pens in 16-packs at Walmart, with smaller diameter cartridges that fit perfectly in the plotter screw after cutting off their tops.