Just another filament spool holder or better "roller", which is meant to be located above the printer.
It uses roller bearings and makes the spool turn real easy, but overall not too easy.

It supports Ø200mm spools up to a width of 76mm.
It has 5 fixation points, suitable for ~3mm self tapping wood- or sheet metal screws.
(I used 2.9x16mm acc. to ISO 14587.)

The funnel on one side is to feed the 1.75mm-filament down to the printer via a short piece of bowden tube,
held by a quick coupler. Tube has to be pushed all the way into the frame throu the coupler, to provide a low friction guide for the filament.

I used a 5mm thick casted acrylic plate to mount the spool roller and a M10x1 coupler.
There's an additional file for a small covering plate around the coupler, to help hide the threaded (and maybe additionally glued) area.

Spool roller is designed to go next to each other.
I was comfortable to have 4 of them, around 450mm above a 300mm wide print bed, which works very well.

Comment to printing the rolls:
In case you have a noticable z-seam or other defects, which is to be expected, smooth them carefully with a file & sandpaper.

Comment to the bearing fitment:
It should be a light press-fit towards the rolls and also with the axis.
You might have to tweak it a little till everything ligns up as intended.
If you find the axis to be a slighly too small diameter for a light press-fit, tap it with
a sharp punch 3x by 120° were the bearing will sit, to create some high spots.

I also include the hole design of the spool holder platform with the "...asm_all.stp"-file, to show my overall solution of a stiff enough platform using this spool rollers.
It includes brackets holding a support-tube and a passive spool holder.
But it's not part of this specific offer, therefore no further support on that side.

Components:

1x frame, 3d printed (no supports),
2x roll, 3d printed (no supports),
2x axis for rolls, made from 82mm long aluminim tube 8x4mm, both ends drilled and M5-tapped,
4x bearing 608ZZ type (8x22x7mm), so no actual (higher friction) seals.
4x flat head screw, M5x10 (or longer) acc. to ISO 10642 or similar.

Optional
1x M10x1 quick coupler
1x Ø4xØ2mm bowden tube piece
1x Covering plate, 3d printed (no supports).