Filament Reel Spacers for FlashForge Creator

Sometimes it's better to hold the filament spool somewhat snug against the back wall of the FlashForge Creator, but the screw-on "cap" on the filament spool holder leaves a lot of space. These varying-size sleeves can be fit on behind it to hold the reel almost-snug, thus preventing filament tangles. (Just don't make it so snug that the spool can't turn easily. That may be looser than you think -- if it's a little snug, that can make the turning filament reel tighten it farther.) There are v