Škoda Auto is flexing its in-house 3D printing muscles at its new Czech additive-manufacturing hub — a place that now rivals some tech startups’ wildest gadget fantasies. Inside, 16 industrial printers (HP's MJF, Stratasys PolyJet & FDM, Formlabs resin, and many more) hum like overachieving robots. Together they spit out roughly 15,000 parts a year. Among the hottest items on the print menu? Fully functional air-vent prototypes.