The idea is good, but infortunately is not reliable in my case. But I can still use it as a mold wall to fill the opening with epoxy

very snug fit and good print, top designer, but sadly didn't solve the problem with Prusament-Spolls and the AMS. The root of the problem is because of the different length of the inner cardboard-peace. Another fix out of this platform helped me to solve the issues with Prusament spools and the AMS. https://makerworld.com/models/182798 But back to this model.... it didn't solve the general problem with the AMS and Prusament spools, but it can improve the grip and the stability. But needed some improvements. What can be improved? - the rims, which have contact to the AMS are a little bit to short in outer diameter, so there is no contact to the AMS. - a little bit thicker in height, but with chamfers, to get more contact area - and las but not least some arrows or a tag for side 1 and side 2.

I tried these but it didn't work on my PETG spools that I have had for a very long time. I am printing a spool size checker.