Sure, 3-D printers can print pretty much any three-dimensional object you can think of - but can they print in zero gravity? That’s what NASA wants to find out next year when it tests a 3-D printer on the International Space Station. So far, the printer, which NASA created with Made In Space, a California-based company, has successfully printed small computer parts in parabolic flights that simulate zero gravity. But the next step is to actually test a 3-D printer in space. See video at Yahoo News.