Most of the spool adapters I see on these file sharing sites are over engineered and too specific to certain printers or AMS/IFS filament changers.

I have seen so many complicated and printer specific models that I decided to create my own simple model that will work with multiple sized spools. Print this with your favorite settings using any filament. the part in the pictures was made using a few different pieces of left over PLA filament. use it as is, scale it to your needs, add to it, whatever.