The small robot from Diatom Studios called the Piccolo was the inspiration for my own TinyCNC.  The Piccolo was first announced in February of 2012, but Diatom Studios just released a new video of their robot with lots more details.  They’ve also released all the source under Creative Commons, so you can track down their source files on Github and follow their excellent building guides to create your own.

New Piccolo video:

Older Piccolo video: