the term is much better known as a nickname for the Mazda RX-7 — one of the few cars that used a Wankel, or rotary, engine. If you ever wondered how these worked, why not print a model?

If you’re looking for a way to demonstrate your 3D printing prowess, how about something like an engine? Given the right design, they’re more complicated than a gun, and a really small Wankel ...

MIT engineers have demonstrated the first fully 3D-printed, droplet-emitting electrospray engine. The device, which would be ideal for enabling small satellites to make in-orbit maneuvers ...