I was inspired a long time ago by the BOB Biped robot by k1201289 http://www.thingiverse.com/thing:43708 and have made a few since. I wanted to give something back to the new makers out there, like I had the chance to get Bob so long ago now. I didn't want to go overboard, so the addition of 1 extra servo isn't all that much on an original bob build, so if you have an old one laying around, this could be a new home for those parts! The main difference with this Biped is the inclusion of the 5th servo, which allows the head to rotate (360' if you have the correct servo) and detect obstacles. The thighs are also angled at 15 degrees to give the bot more stability when walking.