The Meffert's Maltese Gear Cube is was designed by Oskar Van Deventer. The puzzle combines the properties of the Geared Mixup and the Void Cube, but this one has even more gears and also features hollow corners, which allow you to see all the way through the puzzle.  The little gears cause a little "click" when the puzzle in a principal position.
 

• See at Puzzle Master