Here is the design of my spool roller, inspired by the spool arms designed by Rafal Kiermacz (https://www.thingiverse.com/ulightme/about).
I used 608ZZ ball bearings available on A.com and 8mm dia. carbon rods (from an old kite).

You will need to print two (2) fixtures (support à visser) and a minimum of four (4) rollers (galet).

Enjoy !

Anet

A8

No

No

0.2

20%