paper spool ring

Ring for smooth rolling of paper spools with inner diameter 70 mm (like https://www.3dfoxshop.cz/filament-fox-economy-pla-bila-1-kg-2/). You need 2 pcs for 1 spool.

Update: Newer spools from this manufacturer have internal diameter 76mm, so I added bigger V2 version.

Update 2: Paper spools from 3Dfox are no longer produced. Manufacturer switched to refills and printed coils, see link: https://www.3dfoxshop.cz/filament-fox-refill-pla-cerna-1-kg/.