Metalicarap is the real 3D printing revolution: http://reprap.org/wiki/Metalic... It can print solar panels which means it can power itself. It can double as an electron microscope, and importantly it can refine, recycle and print metals. When complete Metalicarap is going to disrupt the entire world. The plastic 3D printers were never going to be more than toys. Eventually you might have both in your house, but the Metal 3D printers are the real game changers.