KeyRing of a combustion engine with turning crankshaft and moving piston.
Release 2.0 d.d. 28-8-2025: improved clicking of crank cheek/crank case and piston pin/crank cheek.


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.


Other keyrings in the same series:
V-Engine KeyRing by Bootjevaarder | Download free STL model | Printables.com
 Boxer-Engine KeyRing by Bootjevaarder | Download free STL model | Printables.com