Surface Test: Temp Calibration Stairs (Customizable)

Test how nice the top surface is with various temperatures.

After making [my version of a calibration tower](http://www.thingiverse.com/thing:915435). I realized I could easily reuse much of that code to make other box-based calibrations. And realized that tower is only testing edge surfaces and minor overhangs. This was my first idea, mainly for testing surface quality (the filament we got seemed to have the most issues with that being consistent)

Disclaimer: The photographs here are actually printed from a tinkercad model I created, and not this model, but exact same dimensions and concept. That one had some issues with the slicer not realizing it had flat surfaces weirdly, but still a good test.

The photos show how the thin side is designed to be thin enough that it could be bent/broken off to be able to more easily inspect the overhangs.

TODO make this extend out in a spiral, to even further illustrate the coolness of 3d printing.