The only added part is this 3D-printed fitting. [Spacefan]’s solution uses a filament roll’s own packing materials ... as much to offer as this other DIY drybox solution, but sure is simple.

Empty spools from 3D printer ... than 30 grams of filament, which makes printing them an attractive way to use up the last bits of filament rolls. We’ve seen drawer-style storage for filament ...