One interesting use for the ams system is automatic filament switching for when you want to finish a spool that has ??? Kg of filament left and you need a print to finish over night. Throw the questionable one in slot one and the new one in slot two, tell they system they are they same and it will switch over on run out.

They don't seem to work very well with the AMS system from Bambu. Good news is can occasionally transplant them to a reusable (and printable too) spool.