Summary

Thanks to Lenbok's design on showing how to use the screw thread library:
http://www.thingiverse.com/thing:8793

Simple table that screws onto a Dremel (or other rotary tools). Rebate into your work bench and then you can sand or grind a square edge. Use PPE and common sense when working with rotary tools.

Added the scad file so you can tweak.

Just added a new scad that allows you to make a bevel table. Although 45 deg is a bit extreme and the printed thread is not as good as I would like,but it still worked.

Clean out the burrs well and make sure bit spins freely else the tool can unscrew itself. Also PLA can melt if you get too much heat on and it goes like Jello.