“In a spare bedroom, where an AR-15 rifle leans against the wall, the 30-year-old software engineer is using a 3-D printer no larger than an espresso machine to make plastic rifle parts and ammunition magazines in between tea sets and chess pieces. The parts print, layer over layer, creating objects like an ink-jet printer etches words. Three-dimensional printers offer a potentially easy way around restrictions and registrations — a source of growing consternation among gun-control advocates and some allies in Congress.”
Weapons made with 3-D printers could test gun-control efforts
