Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:5551851.

A base hub to spin an inserted 12mm outer diameter, 8mm inner diameter tube with reduced friction.

This hub utilizes a F12-21M thrust bearing and a 6001 ball bearing: https://www.amazon.com/dp/B07QKKY9V2?psc=1&ref=ppx_yo2ov_dt_b_product_details https://www.amazon.com/dp/B07FDXPVLP?psc=1&ref=ppx_yo2ov_dt_b_product_details

Designed to be mounted to a base via four M4 screws to support a spinning 12mm x 8mm x 1000mm Carbon Fiber Tube.

Comes in two printable parts: the hub base and the tube insert that the tube slides on to, which spins on top of the thrust bearing.