This thing was made with Tinkercad. Edit it online https://www.tinkercad.com/things/jmTYY5kW3Wf
This is a support for Camera or something else .
After print the pieces , assemble all the pieces so you can see at the picture .
just choose the place at you want fix the red wheel and make a hole to fix it .
so you can turn and block the green wheel .
better result if use support .
use your printing software to add support if necessary .
use meshmixer , cura or any 3D software , so you can add manuelly support .