Navy going for Star Trek with 3D printers

I got a kick out of this, basically a couple of officers are pushing 3D printing for ships to make parts, drones, etc on the fly.  Good idea, but do they realize how long it can take to “print” something out?

http://www.wired.com/dangerroom/2013/04/3d-printed-navy/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A%20wired/index%20%28Wired%3A%20Top%20Stories%29