This SphereBot is based on the EggBot which is an open-source art robot (drawbot) that can draw on spherical or egg-shaped objects.

My version of the Mug Plotter designed by Teed http://edinburghhacklab.com/ . Also used the Eibotboard from the original eggbot from evilmadscientists http://shop.evilmadscientist.com/partsmenu/188-ebb A huge thanks to Hexitex for his brilliant Four jaw chuck http://www.thingiverse.com/thing:5791

To build a simple EggBot