https://thenextweb.com/syndication/2019/08/05/five-3d-printing-myths-dispelled/

The first conviction for 3D printing a firearm was recently reported in London, not long after 3D printed masks were used to trick face recognition. Should we be afraid?

3D printing refers to a range of digital fabrication processes that build objects directly from computer models, without expensive tooling, in layers of material. Although 3D printing processes vary widely, including melting metal powder with lasers or hardening liquid plastic “ink” with ultraviolet light, most people tend to think of 3D printing desktop machines that melt spools of plastic.