This is the fit iteration of an experimental design for a spherical robot / rc ball (D210mm). To make this prototype I used a 3D printer and a laser cutter, but it could be made solely by the mea of 3D printing. I have also included the initial files for controlling it using arduino and an android app (built using MIT App Inventor). If you are interested in building this, I suggest you work a bit on a better design for the electronics holdebalancing (steering) system. Any thoughts or suggestio are welcome! Fully functional prototype: Thanks!