therefore really only useful for terrorists What? I'm finding it hard to believe that an odd-looking 3d-printed single-use gun would be useful to terrorists (

therefore really only useful for terrorists What? I'm finding it hard to believe that an odd-looking 3d-printed single-use gun would be useful to terrorists (or criminals in general, actually). What you need as a mugger, for example, is a recognizable threat. The gun doesn't necessarily need to work but it does need to look like a gun. Terrorists have it even worse, as they're generally looking to threaten a whole lobby full of people; what they're waving around had better look really automatic. And had probably better work. I can't imagine that a single-shot weapon that looked unrecognizable would suit their needs. A single-shot gun might be useful to a murderer, but hardly an ideal choice (what if you miss)? And it might be useful in a self-defense scenario, but the same caveat applies. In fact, they actually make single-shot guns. (http://en.wikipedia.org/wiki/Derringer http://en.wikipedia.org/wiki/Derringer) And they aren't used by terrorists! They're used by pirates in movies. And in real life, generally, women carry them in purses. Which, to come full circle, means I would support the availability of 3D-printed guns, since I perceive the most likely use would be in a self-defense scenario as a "well, it's better than nothing" option.