https://www.youtube.com/watch?v=ONnFEvNyB_gIt's powered by an Arduino board and remote controlled via RF. This droid self-balance on two wheels, play sounds, and has several programmable LEDs.Printing the whole body and head takes about 200 meters (656 feet) of filament, and 50 hours on a regular PLA 3D printer. No support required.Instructions coming soon!Some instructions are here http://www.instructables.com/id/BB-8-Droid-3D-Printed-Remote-Controlled/