A startup called Voxel8 is using materials expertise to extend the capabilities of 3-D printing.
Three cofounders of Voxel8, a Harvard spinoff, are showing me a toy they’ve made. At the company’s lab space—a couple of cluttered work benches in a big warehouse it shares with other startups—a bright-orange quadcopter takes flight and hovers above tangles of wires, computer equipment, coffee mugs, and spare parts.