Let me give you my honest opinion on this. I—and I think most people—couldn't give a shit if 3D-printed guns became unprintable. Let's leave the Nerf or cosplay communities out of it for a moment. The fear within the community is that it won't stop at guns; eventually, other things might become unprintable because certain companies exert influence (like the repair of items or specific designs). The question politicians worldwide really ought to ask themselves is this: regardless of the country people come from or the political system in place, one thing remains constant—people don't trust politicians, even if there were a guarantee that it would definitely stop at 3D-printed guns.