Flexible Cardboard Spool Adapter

Filaments that are distributed on cardboard spools may be considered an effective, environmentally friendly way of packaging filament. For those with multi-material systems (like the Anycubic ACE Pro, Bambu Lab AMS, or Creality CFS), cardboard spools come with downsides that make them problematic. The edge of the cardboard is the Achilles heel when it comes to this filament changers. The edge is either highly rigid and smooth, wears out while being rolled in the filament changer and slips on the rollers, or are damaged and not perfectly round due to shipping or mishandling. If you're like me, you've printed different spool adapters that attach to the sides of the cardboard spools to help them roll in the filament changer. You've then realized that the different sizes of spools makes this a bit of a process. A new cardboard spool often finds that your existing adapters are a touch too small or a touch too big, and the hunt for a new adapter specific for your spool begins again. If your cardboard spool is damaged and/or bent, it's often hard to get the adapters to actually make a good fit, causing its own kind of havoc. This model addresses all theses problems by not using the outside of the spool but the inner hub of the spool using integrated flat springs to provide tension, centering the spool within the adapter and leveraging the adapter's own outer perimeter as the new "wheel" that will ride on the rollers. The wheel accommodates spools of up to 204mm in diameter which, based upon my research, covers 99% of the cardboard spool variants out there. Each adapter uses less than 30g of PETG, recommended to allow them to be mounted onto the cardboard spools that will be dried in a dedicated filament dryer unit. 60g per spool, 240g for each four slot multi-material system. Instead of specific vendor adapters - how about one flexible adapter to rule them all?