Models
Calibration Cube 3D Printable Models. Makeshape.co have 3 Calibration Cube 3D Printable Models.
Illusion Square/Fidget Cube
Makerworld
CrownWalker
Free
Spin Cube (Print in Place)
Thingiverse
Liminil
Free
The Ultimate Catapult, almost. [Seej]
Thingiverse
Roguemat
Free