I built an interesting Bi-Polar Plotter with multi-pen capabilities this year. Really cool to look at. :) https://hackaday.io/project/177633-dual-disc-polar-pri

I built an interesting Bi-Polar Plotter with multi-pen capabilities this year. Really cool to look at. :) https://hackaday.io/project/177633-dual-disc-polar-printer https://hackaday.io/project/177633-dual-disc-polar-printer