This incredible solar powered 3D Printer can print glass using Sand as filament
http://e03e8c9293b9d36a7640-e80bc937...16C9960A09.jpg
It runs entirely on sun rays (instead of a laser), and the scientist that invented it hopes it can be used in developing countries where resources are limited.
You can read more about this at http://www.scidev.net/global/energy/...most%20popular