Ghost gun printing is surging, but AI screening and microscopic toolmarks are helping slow untraceable firearm production.

3D printed files are used to create tangible objects from digital files. Find out more about the benefits and uses of 3D printed files for visually impaired people. Skip to main content .

To be sure, 3D-printing files aren’t a huge share of the dark-web market yet; they accounted for just 11 of the hundreds of for-sale items catalogued by the RAND researchers.