Over the past three decades, 3D printing has expanded from modest origins—a stereolithographic prototype designed by Chuck Hull of 3D Systems Corp. in 1984—to being hailed, in 2012, as the vehicle of a third industrial revolution. In the past few years alone, we’ve 3D-printed Van Gogh’s ear, a hi-tech waterproof bikini, some synthetic rhino horns in an attempt to stop poaching, and began to make real inroads into the world of 3D-printed prosthetics. At this year’s Paralympic games in Rio, Denise Schindler became the first Paralympic cyclist to use a 3D-printed prosthesis. Oh, and you can also turn your child’s latest drawing to sculpture for a modest-ish fee.…