A simple roller bearing spool 'runner' intended to fit in the bottom of an airtight cereal container for rolls I do not use often, feeding the filament out of the pour hole

The photos are of an earlier iteration, I have changed the cutout to a hull from a resized cylinder to allow easier matching to the space between the 2 bearing mounts

You can change the length, and bearing size to what ever you have/need

If the ID radius of the bearing is greater than the wall thickness, the mounting 'ball' will show on the outside, as it does on my 608 stl