Printrbot Play Y-axis upgrade Cable Shelf

Sick of having to babysit your Play during the first several layers? This is for you. Download V7

Update 4/15/16: New version, last update for awhile. This desgin (v7) looks like a winner :)

Update: 4/14/16: Completely parametized the design, so Andy's cable shelf is no longer necessary.

You'll need [Andy's cable shelf](http://www.thingiverse.com/thing:905768) if you want to modify the .scad.

Update: 4/12/16. Updated with V3. Much easier to print and actually works. Also uploaded an