3D printers can be used for a lot of cool projects. Whether it is 3D printing objects, or modifying the printer to do other things, there are countless numbers of things that can be done with these machines. One man has taken his 3D printer and simply added a pen to it, in order to create really interesting looking line art. He even wrote a free program to convert black and white photos into gcode for 3D printers. Read and see more at http://3dprint.com/17819/3d-printer-line-art/