Bambu Lab also uses RFID with their 3D printers and filament, specifically for the AMS, their automatic material system. Since it allows you to use 4 materials (or 16 if you connect 4 units at the same time), the tags store the type of filament and the color, to make configuration much faster. Automatically loads the info when they’re slotted in. Thankfully, there’s no usage info, so they don’t “go bad”. The rolls split apart to refill, and you can either buy refills on their site (rolls with no spool), or you can harvest the filament from another brand. They also aren’t mandatory, you can still manually configure every slot in the AMS.
Apparently the tags are mifare classic 1k based, with detection of gen1 magic tags, so using your own is tricky. Found some photos online:
I recently bought a Bambu Lab P1S (albeit without the AMS, didn’t have the initial funds), and they included a partial roll of their filament. Need to play around with the tags a little.