Deathly Hallows/Harry Potter Calibration Cube

Tired of making the same old boring calibration cube? So was I, so I designed this cube to allow you to run a series of tests. 

Not only will you have the standard things you're looking for in a calibration cube, but you also get a few more things.

-Built in Retraction Test

-Built in Overhang Test

-Built in Bridge Test