Tag Archives: RepRap Prusa

Video: 3D print a fully-rotating four-cyclinder engine model

Maker builds a moving four-cylinder engine with a RepRap 3D printer.

Over the past couple of months, we’ve seen the emergence of 3D-printed vehicles. Most recently, Local Motors demonstrated the future of car manufacturing by printing the main structure of an entire car right on the floor of the 2015 North American International Auto Show. The company extrudes just about everything that it can, both exterior and interior, before plugging in the wiring, suspension and engine. However, that begs the question, how close are we to the day of a 3D-printed motor?


Well, engineer and auto enthusiast Eric Harrell decided to design and replicate a Toyota 22RE four-cylinder engine using a RepRap Prusa 3D printer. In total, the entire build consisted of 80 separate parts and required just about three days to finish. While it may be a bit longer than your typical DIY project, keep in mind that the end result is a fully rotating engine with a working crank, pistons, and valve train — with valves that open and close. Other than some bearings and fasteners, Harrell notes that all the components were 3D-printed.


“It may not be the most exciting engine, but its the only one I had in my garage. Great if you want to learn about engines and how the moving parts in them work. All parts are printed except for a few bearings and fasteners,” Harrell explains.

Intrigued? You can learn all about the project on its Thingiverse page here, and watch the Maker elaborate upon his build below.