Ender 3 spool holder sleeve to use the role with 608 ball bearings

You need 608 ball bearings (from inlinescates) and a m8 threaded rod with screw nuts.

Glue the bearings with 2K Epoxy into the role and place the washer with the narrow end to the bearing.

https://www.youtube.com/watch?v=0ZQlMr3waz0&feature=youtu.be