Olaf Diegel, a professor of mechatronics in New Zealand, uses 3-D printing to craft bespoke electric guitars. Diegel starts with computer-assisted designs inspired by beehives, scarabs, atoms, and electrons, among others, and then prints them with nylon powder deposited in 0.1-millimeter-thick layers. Building up each one of Diegel's 300-millimeter-by-350-millimeter guitar bodies takes about 11 hours. When paired with a wooden neck and electric pickups, a completed guitar creates acoustics similar to that of a Fender Stratocaster, Diegel says. Plus, the synthetic ax is nearly indestructible—no matter how hard the owner shreds.