KeyRing of a combustion engine with turning crankshaft and moving piston.
Printing
No supports.
I printed with PLA+, layer height 0.15 mm.
Assembly
Use some grease or oil on the moving parts for a smooth operation.
No glue.
Click the piston in the cylinder, and the crankshaft in the crankcase.
Operation
Put your finger on the round button and turn the crankshaft.
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