Thingiverse user and maker Marcio Teixeira set out to create a 3D printable device that could paint simple pictures with light, but ended up with the Rainbow Apparatus. The Rainbow Apparatus is a simple lamp that uses red, green and blue lights to demonstrate the concept of additive colors for a physics classroom. It is constructed from several 3D printed parts, the primary colored lights and a simple power supply. You can read more about the device on 3DPrint.com: http://3dprint.com/79623/3d-printed-rainbow-apparatus/


Below is a photo of the Rainbow Apparatus setup casting shadows: