Each week our friends at Inhabitat recap the week's most interesting green developments and clean tech news for us -- it's the Week in Green. Of all the technological breakthroughs we've witnessed in recent years, the emergence of 3D printing technology is one of the most exciting. This week saw a number of breakthroughs in the realm of 3D printing, beginning with Deep Space Industries' plans to develop space-based 3D printers that could
