A while back we ran an article from Soldier Systems Daily about a 3D printer used to build an AR15 lower.
(https://kitup.military.com/2012/07/3d-printing-weapon-manufacturing.html)
Today SSD showed us another use for such a device and opined about how this sort of technology should be folded into the military and military-medical community. It is definitely worth the read.
http://soldiersystems.net/2012/08/21/disruptive-tech-3d-printed-exoskeleton/
There are also many other good reasons to check in frequently at Soldier Systems Daily.
Disclosure: Kit Up Associate Editor David Reeder occasionally writes for Soldier Systems Daily in a guest, non-paid status.