These rings fit on the outer rim of cardboard spools to allow you to use cardboard SMARTFIL spools in your Bambu Lab AMS.
Measured with caliper and adapted to the latest version of SMARTFIL cardboard spools from 2024 750 or 1000 gr.
It's just the right size so you can close your AMS perfectly, it fits very well
Both has centering dots for better fit
0.4 Nozzle. Less than 10 grams of filament and 15 minutes of printing
Enjoy It ;)
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