Triangular Dovetail Joint Microbox

The idea for this came from Thing 11977, although the design is all new.

Basically, it's an apparently impossible dovetail joint that opens by rotating. My interesting little observation was that it needs almost no thickness, and no core, in order to lock and rotate well. It's a tiny empty box. As a result, this prints in a few minutes on our MakerGear M2 -- **it prints better and nicer scaled-up 2X**.

There are two versions here as STL files: one with the new University of Kentucky logo o