About this 3D model

This is an "impossible" dovetail puzzle cube. The reason it is "impossible" is that there are dovetails on all 4 sides. However, instead of the dovetails going directly through the cube, these go through adjacent sides. Great for confusing friends who have not seen it before. The 3 different versions of the bottom piece have different tolerances ranging from 0.2mm to 0.4mm.