This is a reducer to adapt Jayo/Bambu spools with an internal diameter of Ø72.5mm to Snapmaker u1 spool holders with a max diameter of Ø55mm.

The clamping thread between the ring nut and the body has a 6mm pitch and is an m72.

very useful if you need to adapt a Jayo/Bambu spool to the original Snapmaker u1 spool holder,