The mechanism is mounted on a metal/aluminum frame held together by 3D printed mounts.

A heavy duty metal bearing is used to let everything spin smoothly.

A micro geared dc motor is used in combination with the driver of a SG90 servo.

The potentiometer detects the angle.

First working prototype of parts printed in grey PLA.

First working prototype printed with grey PLA.

After this I made a couple revisions to make it more steady using black ABS.