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

In a way, one can argue that temperatures where τ R > tr,ip should be irrelevant for 3D-printing conditions since an appropriately shaped strand on the surface should be formed before the nozzle is ...

NASA's Reactive Additive Manufacturing for the Fourth Industrial Revolution (RAMFIRE) project test-fired a 3D-printed engine nozzle at Marshall Space Flight Center in Alabama. See the test in real ...

Yu led the development of the printable concrete ink, calibrating variables for the 3D printer like water-to-binder ratios, nozzle size, and extrusion speed. “We ran a lot of trials,” he says.

Test results showed that the material continuously absorbed CO2 over a 400-day period.