About this 3D model

This thing was made with Tinkercad. Edit it online https://tinkercad.com/things/gMlCjUsQp39 I have been able to mostly compensate for the Y-Axis droop in a Printrbot Simple (Beta) by renaming the slic3r.pl that I use to slic3r.orig.pl and placing a simple Perl shim script as slic3r.pl which subtracts a portion of the Z coordinate from the Y coordinate for all vertices. The model here is what I use to test the calibration. It has a nice, flat base to put a T-square on and thin walls to avoid using too much filament. [UPDATE: see instructions for a better alternative]