With this adapter u can use your empty Bambulab reusable spools for Masterspool refills according to richrap standard.

You get a reliable spool that works without problems in the Bambulab AMS and you need just 100g of filament.

UPDATE 07/2023:
I got the hint from some users that the adapter is too tight on the coil.
It turns out that the older clear Bambulab coils with the small holes like in my pictures have a smaller diameter than the newer coils with the fewer but larger holes on the side walls.
For the clear coil with fewer but larger holes I have created a variant enlarged by 8/10mm.

I recommend for:
-clear Bambulab Spool with many, small holes on sidewall the standard version!
-clear Bambulab Spool with fewer, big holes on sidewall the "+0.8" version!
-the grey high-temp Spool the "+0.8" version!

have fun printing with refill material ;-)