Bearingless Dry Box Auto-Level Spool Base Roller

Requirements leading to this design:Accommodate spools of varying widthsFew moving partsNo bearings/greaseLight/could be stored upside-downAdditional materials:Cereal containers: https://amzn.to/4ej49cn4 mm PTFE tubing: https://amzn.to/3TNTkXHOne section cut to 82-84 mm and another cut to 72-74 mmHygrometers (optional): https://amzn.to/47HuVspThese work well with my AMS-Compatible, Tension Filament Spool Clips. If you store your boxes upside-down (like I do), consider holding the far ends of the bottoms of each roller to the boxes with low strength mounting tape or stick-on hook-and-loop. (I use 6-10 mm squares on either end, and it's plenty.) That's a trick you can use with any lightweight spool roller, including @Darren's and @Brimbecas's (from which this design is remixed). I wanted a dry box roller that fit the cereal boxes I was using, specifically for filaments not compatible with AMS (primarily those with carbon fiber). There are tons out there, but most of them