NASA's 3-D printing breakthrough - it's all rocket science (images) Summary: A successful test may help NASA significantly lower the cost and reliability of expensive rocket engine parts by building them with a 3-D printer. By Andy Smith | August 27, 2013 -- 19:40 GMT (12:40 PDT) Previous | Next Image 8 of 10 This CT scan of the 3-D injector was performed to make sure that the part was up to standards. Credit: NASA Topic: Nasa / Space Kick off your day with ZDNet's daily email newsletter. It's the freshest tech news and opinion, served hot. Get it.