This is pretty interesting. Rockets, essentially, are soda cans.
Rocket Labs who launch from New Zealand 3D print their engines. Rocket Lab Completes 100th 3D-Printed Rocket Engine
Meet Rosie, the rocket building robot. Rosie processes Electron’s carbon composite structures, including stage 1, stage 2, and the fairing. In only 12 hours, all marking, cutting, drilling, milling, and sanding is completed on a vehicle.