Piston Keychain (press-fit version)

Another take on the piston-keychain with a movable connecting rod.
Designed to maximize quality at small size and reduce printing time.

Only two parts: cylinder head and connecting rod.
No glue/screws/pin required: the rod has to be pressed into the head until it clicks in place.
Force is required! I used a vice:

https://youtu.be/D8rXq-3LFt8

Tested with PETG, 0.2 layers, 0.4 nozzle, 2 perimeters, no infill required.