Ubercool video from GE Aviation on their 3d printed fuel nozzles. 3d printed part is five times as durable as regular one, 25% lighter, runs cooler because of internal cooling structures, only one part instead of 18. Real revolution.
Source:
http://www.youtube.com/user/GEAviation?feature=watch
Source:
http://www.youtube.com/user/GEAviation?feature=watch