Parametric slide lid box

**Note**: I updated the scad file to make it a bit easier to maintain. The code is cleaner since I learned the `module` command. :-)

This OpenSCAD file (requires OpenSCAD 2014.03 or newer) can be used to generate a model of box with a sliding lid. You can easily edit constants in the OpenSCAD file to adjust the box's dimensions, wall thickness, and even add a small "button" on the lid to make it easier to open. Adjust the values as necessary, export as STL, and import into your favorite slicer/Repetier Host.

Depending on the quality of your printer (or if you print a brim), you may need to trim the lid slightly.

No support structure should be needed as the lid angles are all 45º.