Or just surf to the Wikipedia if you are too lazy to go the library. Example: http://en.wikipedia.org/wiki/Explosively_formed_penetrator http://en.wikipedia.or

Or just surf to the Wikipedia if you are too lazy to go the library. Example: http://en.wikipedia.org/wiki/Explosively_formed_penetrator http://en.wikipedia.org/wiki/Explosively_formed_penetrator Of course, perusing the above link, it would seem the main limitation on proliferation is chemical synthesis of the HE, not 3D printing technology.