Printrbot + Upgrades [X-bridge, Extruder Mount, Y-Clips...]

These files include all of the parts I designed for improving my printrbot.

For a complete description of my modifications read here: http://polakiumengineering.com/?p=1905

http://www.youtube.com/watch?v=gZqbWyfKseI

The final revision is now uploaded, all of the tolerances should be perfect for properly configured printrbots.

Updates:
9/24/12 - X-stop is fixed in place, non-adjustable
10/04/12 - Motor mount now compatible with 28mm 36 Tooth GT2 Pulley
10/09/12 - Added LME12UU comp