Simple mechanics - gears that rotate together can be controlled by either wheel.

Gears can be arbitrarily distributed on prepared pins, but only one option after turning one wheel turns all wheels

The crank gear requires a combination of several parts and an M3-8 bolt.

Before use, I recommend that you check whether the printed object has sharp edges, or tear them off with the help of a knife for pulling the edges or with sandpaper.

More puzzle in my collections.

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Jednoducha mechanika - ozubena kola, ktere se toci spolu, lze ovladat kterymkoliv kolem. 
Ozubena kola lze libivolne rozmistovat na pripravene piny, ale pouze jedna moznost po otoceni jednim kolem otaci vsechny kola

Ozubene kolo s klikou predpoklada kombinaci nekolika dilu a sroubu M3-8.

Doporucuji pred pouzitim overit zda vytisteny objekt nema ostre hrany, tyto pak pripadne strhnout pomoci noze na stahovani hran pripadne smirkovym papirem.