The current possible threat from 3D-printed guns is next to nil, but U.S. and the UK authorities have prohibited 3D-printing of firearms.

The concerned U.S. authorities had previously confirmed that all 3D-printed handguns should include a 6-ounce piece of steel within its body made entirely of plastic. The addition of steel will ensure that the firearm is noticeable using metal detectors and, therefore, in compliance with the US Undetectable Firearms Act.

On Moday, December 9, the U.S. Congress voted to renew a ban on completely plastic guns that can go undetected by metal detectors and X-ray machines. For the next 10 years, all 3D-printed firearms will need to include a steel object in the firearms so that it can be detected using relevant devices.

Metal components in the plastic guns may be removed so that it goes undetectable. However, Congress has not voted in favor of any restrictions on the removal of the metal component from a plastic gun.

"Some plastic firearms technically obey the quarter-century-old law with a detachable metal part that can be slipped off to evade airport security. Democrats said the stricter language was needed in an era when improved and increasingly accessible 3-D printers can produce functioning guns," The Associated Press reported.

The UK Home Office has also clarified information regarding 3D-printing of guns. The Firearms Act 1968 clearly says that 3D-printed firearms are prohibited, and the act also points out that it is an offence for someone to possess, purchase or acquire any component part of a firearm without a valid certificate.

3D-printing is at a nascent stage and moreover, printing firearms requires an expensive high-end 3D-printer, which means an average consumer will be unable to print a real firearm at home. And, even if a person is able to 3D-print a gun, it may not work at all.

However, it seems that developing technology in the 3D-printing area has definitely got authorities on their toes.