There was a couple of posts on Reddit recently about these Plastic House cereal containers that are the perfect size for a 1KG spool of filament.

I bought some and found that they are in fact the perfect size for most spools, but my go-to filament of Atomic Filament seems to have a thicker spool than most brands and it was rubbing on the bottom of the (tapered) sides of the container.
So I made this roller so that the spool sits higher inside the container (basically at the very top of the container) and now the spool fits perfectly fine.

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