3D printed guns might be formally illegal in the UK, but that hasnt stopped the countrys armed forces from adopting the technology for military purposes. Defense company BAE says that in December, British Tornado fighter aircraft conducted successful test flights with parts made in 3D printers for the first time. The metal parts were created by BAE at a Royal Air Force base in Norfolk for four squadrons of Tornado GR4 jets. Some of the parts created with 3D printers — including covers for cockpit radios and support struts for working on air intake doors — cost less than £100 ($163) to make.