Printrbot Play Cable Shelf PCC Variant

This clip slides onto the frame of the Printrbot Play to keep the cable up and stop it from getting caught on the bed as it moves back in the Y direction. Remix of [@andyleer](http://www.thingiverse.com/andyleer/about)'s [
Printrbot Play Cable Shelf](http://www.thingiverse.com/thing:905768).