This once is nice since it doesn’t require a 3D printer, uses an arduino (over PIC), and can be built with hand tools. Oh and its a cheap build too. Me, I think I would use a CNC shield over building my own motor controller board since they are pretty cheap anyways. I couldn’t figure out what the egg holders where till I looked at one of the picture comments. Lego Wheels! Clever Idea. I thought maybe they where bottle tops from soda bottles.
http://www.instructables.com/id/DIY-Arduino-controlled-Egg-Bot/