Previous discussion: 3D printing pen lets you draw sculptures in thin air (newscientist.com) http://news.ycombinator.com/item?id=5243271 http://news.ycombinat

Previous discussion: 3D printing pen lets you draw sculptures in thin air (newscientist.com) http://news.ycombinator.com/item?id=5243271 http://news.ycombinator.com/item?id=5243271