Printeable T-2020 frame

I saw this thing and thought we need a customizer version of this frame.
http://www.thingiverse.com/thing:1961848

Please see the full description on his thing.

I made a small change to the pin hole so it might fit better on a printer with a bit of back lash artifact in the corners.

Features:
1. Give it the length of the T-Frame and build higet of your printer and it will output a set of frames to glue together.
2. Change the tolerance value to make the pin and hole fit better on your