PolyBot Socket Ball Holder

I reached into the way back machine to modify this design. While my wife was putting together her PolyBot, she cut her finger on the sharp corners of this thing: http://www.thingiverse.com/thing:5126

As much as I love that design, it was innevitable that sharp corners would cut someone. My wife's comment was; "If you're going to have kids assemble this, there can't be any sharp corners".

This thing takes a different direction than the socket based joint. Instead of using 'sockets', it u