Printable plain bearing with hollow center

Sometimes you need to pivot around empty space. I am working on a weaving machine, and this requires several threads to spin around a central core which moves axially. Maybe you need this for something of your own!

This is a "plain" bearing: (somewhat rough) plastic bearing on (somewhat rough) plastic. It won't handle high loads or achieve high precision... But sometimes that's OK.

The whole thing is held together with a printed retaining ring and requires NO VITAMINS.

https://youtu