Lasercut Prusa Iteration 2 Thick Sheet

Explanation of the Prusa's thick sheet is here: http://reprap.org/wiki/Thick_Sheet

This design has a few improvements:

-Support for Prusa Iteration 2's single thick sheet design.
-There are holes for belt clamps, lm8uu bushings, and Prusa's heated bed.
-Holes in the middle of the thick sheet to reduce weight.
-The edges of the holes are rounded to prevent stress from concentrating in small areas.


The design could be improved by adding holes to mount something for opto endstops an