During the summer of 2012, Cody Wilson hung around J&J, a car-repair shop run by two "goofy" guys in their late 20s. The Austin warehouse was crowded with engine blocks, car parts and Pelican boxes that never seemed to have been opened, but the 24-year-old came as he pleased, with access to shop machinery. He had spent the larger part of his second year at the University of Texas Law School learning how to operate a 3-D printer.