This is the Elegoo Filament Ring for the cardboard spools using in the AMS I found on the Elegoo website.
It is possible you can't close the AMS because the ring is rubbing the inside of the AMS.
To solve this, don't close the AMS completely or use the AMS Lid Riser for Bambu Lab AMS.
Function: Reduce the possibility of delamination caused by moisture and friction on the treatment tray, and adapt to AMS (because AMS will rub the bottom paper tray, causing the paper tray to easily delaminate)
Tips:
1. It is recommended using PETG for printing
2. Change X-Y hole and contour compensation to 0.1 if it is too tight