I find it very interesting that a discussion about creating weapons that are 3D printed turn into a discussion of whether or not Obama is doing his job or is a liberal or not. People think the next revolution is going to happen in their own back yard. It's totally ridiculous to think that even a million people armed with hand guns that are 3D printed out of ABS plastic are going to take on the United States Army, Air Force, and Marines. A million people like that would have the same speed bump equivalent of our solders in South Korea stopping North Korea from invading South Korea. By the way I 3D print models in ABS plastic and trust me they are brittle, you don't want to have an explosion happening inside a piece of ABS plastic. The thing would have to have 1/2 inch thick plastic to withstand even a few shots. In the future the materials may be better suited for the purpose. In fact I have a material that may be up to the task, but further research is necessary. Practical guns are still 5 years away from 3D printing. Which is a good thing after reading the comments here. The revolution people really need to get bigger weapons, munitions like bazookas and things before they become any deterrent to the US government. (I suppose people feel it would be a great thing for everyone to carry around their very own bazooka?) I for one think that taking weapons home from the shooting range shouldn't be allowed till the age of thirty and not then until their is a thorough background check and psychological evaluation. It's a fact brains are not fully developed until the age of 30. I wonder if the Boston bombers would have been able to pass a psychological evaluation? My guess is NO! As for a background check, the US Government failed in that respect the Russians told us they were dangerous and we ignored them.