This is an adapter ring (Spool tire) for use with Filamentive cardboard spools in Bambu Labs AMS.
The ring clips into place on Filamentive cardboard spools and shields the outer edges from wearing down and producing cardboard particles when being used inside the AMS.
This has specifically been designed to allow use with the AMS lid closed. If the spool is slightly larger than normal and pushes the edges of the tire out, causing rubbing on the inside of the AMS lid, remove the tire and try to compress the edges of the cardboard slightly then refit the tire again.
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