Universal spool holder

for details: https://www.youtube.com/channel/UCXc4j_xI8dTV32vxuVKIoPg

8x bearing 5x16x6
4x screw M5x25 or longer
4x nut M5
4x washer M5 1mm thick (optional)

My printer got a linear rail upgrade. The bearing are from the old plastic v-slot wheels.

Make sure the bearings can spin freely, there`s no need for a tight fit. A little bit of play is your friend.