This is an adjustable filament spool roller. You will need 1 male side, 1 female side, 4 hubs and 4 rollers. This uses the standard 608S skateboard bearings and 4 - M4 x 25mm screws, along with the complimentary washers and nuts.

I also added some rubber feet to the bottom to keep if from slipping. The holes in the bottom are for a 10-24 tap.

This was designed in imperial units so either import it accordingly into your slicer or scale it up x 25.4.