"Excellent choice. More sustainable." T.R. turned around, took it all in, peered through the milky plastic bins at drone batteries, drone transceivers, drone propellers, spools of colored wire, tiny metric fasteners, jewelers’ screwdrivers, heat shrink tubing, stainless-steel hemostats. A 3D printer where a microwave oven had once been installed. "Man," he exclaimed, "you are the Drone Ranger!"