If you use filament from suppliers that cannot be automatically recognized by the Bambu Lab AMS unit via NFC, then this could be useful. Especially if there are different "generic" filaments of the same type but from different manufacturers in the slots, the AMS will not differentiate between them. I have often lost track and have come up with this solution (inspired by similar solutions).

The holder is attached with double-sided adhesive tape.

Create yourself Filament-Marker-Tags with the provided Fusion360 file or ask in the comments for specific markers. I can create and add them if needed.