Possessing files that can be used to 3D print firearms will soon be illegal in New South Wales after new legislation, passed last week by state parliament, comes into effect.
Among the provisions of the Firearms and Weapons Prohibition Legislation Amendment Bill 2015 (PDF) is an amendment to the Weapons Prohibition Act 1998 stating that a person "must not possess a digital blueprint for the manufacture of a firearm on a 3D printer or on an electronic milling machine."
Thanks to Shall Not Be Questioned for the link.
Let's have some fun. Get governments convinced that there are STL files that will let you 3D print concealable 10 MW carbon dioxide lasers.