Architect and Industrial designer Ekaggrat singh Kalsi just launched an Indiegogo campaign for his beautiful 3D printable mechanical HOLO Clock. Most of the clock structure is made up of entirely 3D printable parts, including the rings, the gears and the main clock structure itself. The assembled mechanism itself is driven by a stepper motor, and controlled by a small Arduino-based microcontroller. There are four different options available to backers ranging from $25 for the Basic Kit to $200 for the Premium Kit. You can learn more on 3DPrint.com: https://3dprint.com/138308/holo-clock-indiegogo/