To start the project, Sheffler gave the students CAD (computer-aided design) files for the 43 parts of the replica engine. But it wasn't as easy as just plugging those instructions into a 3D printer.

These days it’s super-easy (not super-cheap) to go out and buy a 3D printer. But if you’ve got the mad skills like [Mario Lukas] maybe you can build a 3D print using a bunch of scavenged parts ...