Printrbot Simple Bed Extension

Enables the Printrbot Simple to use the full width of the bed, extending the width from 100mm to 140mm (+40%).

All holes should be drilled and tapped with a #6-32 tap set. Use 3/4" x 1/2" (1/16" thick) angle aluminum for the front brace, and 3/4" x 1/16" thick aluminum for the rear brace. I used two springs (one inside of the other) for the drive line tensioner.

New cord will be needed for the drive line (I recommend Spectra over Kevlar, as the Kevlar line will frey with use.)
2x 330m