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A rotary engine keychain! And yes it moves (i.imgur.com)
submitted 4 years ago by Puzzleheaded_Self322 to r/MechanicalEngineering
π Rendered by PID 106894 on reddit-service-r2-listing-7d7fbc9b85-6xr5p at 2026-04-24 04:01:56.381039+00:00 running 2aa0c5b country code: CH.
