Print-In-Place Fidget Cube

A print-in-place folding fidget cube, with customization options for size, shape, and clearances. As you fold the cube it turns inside out to form another cube! Makes a nice gift or 3D-printing demo, and is fun to fidget with while on the bus, standing in line, etc.
This model prints in ONE PIECE (!), fully assembled, without raft and without supports, and then you snap it open in a couple of places until it moves freely; see the instructions. Customize size and tolerances for you printer wi