This kind of ends the debate. Go to Glen Beck's website for a video of the interview and a video of a guy who printed some of the parts for a full auto 223 and then used an upper (metal barrel, etc).
The print files are available for download on his website too.
If DDD really does bring 3D printing to retail customers in the next few years, well then just print your own 30 round magazine or design your own firearm.
Unfortunately the material has very little structural integrity. They physical properties are inadequate.
You listen to Glen Beck and FOX???.... No wonder your head is so far up your az.