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Bambu's official filament roll has RFID tags on both sides, and on AMS there are two RFID-reading circuit boards that can read the filament information.
RFID reading function can be set on the screen for updates on insertion/startup. If “Update on Insertion” is enabled, AMS starts to read the filament RFID after pre-loading. Similarly, with "Update on startup" enabled, after each restart of the printer, it will also start reading the RFID of each slot filament in turn.