Clever 3D Printed Free Piston Stirling Engine

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I often browse Stirling engine videos on YouTube, and I recently came across this cleverly built free piston engine which is made with mostly 3D printed parts and I thought I'd share. I take no credit for the design or build of this engine, I just thought that it was neat. And it's a free-piston engine, which makes it even better.


https://www.youtube.com/watch?v=Dxu6yYSwVnk

Enjoy!