Puzzle Cube Stand

I think the normal triangular cube display stands are boring and kinda dinky looking, so I designed this one somewhat inspired by [this stand on shapeways](https://www.shapeways.com/product/VTGQARFE3/rubiks-cube-stand).

Fits a standard 3x3. I like this because it keeps the logo upright, and you can half-turn an M layer or just fiddle with it in the stand on your desk!

Also added a second version that allows the edges to turn freely while the M slice is held up.