Kritzlerbot Polargraph (printable)

More pictures:

http://www.flickr.com/photos/lanthan/sets/72157629185958843/with/6823716121/

Inspired by the amazing Kritzler http://tinkerlog.com/2011/09/02/der-kritzler/ and Polargraph http://www.polargraph.co.uk/ plus some itch to make my own.
Also see AS220s:
http://www.as220.org/labs/drawbot/

I liked the polargraph rotating axial mount, but since I do not have the suitable bearings, I printed sliding rings from pla. The fit is quite close, and with some Teflon spray they appear to