HeyBub wrote:
"... Defense Distributed, released a video this week showing a gun
firing off over 600 rounds-illustrating what is likely to be the
first wave of semi-automatic and automatic weapons produced by the
additive manufacturing process."

Downloadable plans freely available.

Plastic (on the new guns) acts differently than metal, so, "The idea
is not to print components for guns that are, but the guns that will
be..."

http://arstechnica.com/tech-policy/2...er-600-rounds/

Still, on thinking about it, the ability to "forge" your own parts could
come in handy for home repairs!

I suspect, in a couple of years, like open-source software, there'll be
masses of plans one can download for the home 3-D printer. Everything from
switch-plates to water sprinklers to pet food bowls.