Summary

Why?!

This is meant for refills with a core diameter of ~100mm, outer diameter of ~198mm and a width of ~50mm (filament might sit a little loose if wound to thin).

How to ..

This approach combines easy to print model and 6 M3 or M4 screws, which has everbody lying around. Done.

Also ..

You may want to print the side with the sticker with 1 or 2 bottom layers just for the sticker.

People who need a certain spool center diameter can easily create their own adapter plate. The diameter of the circle through all screws is 90mm.

If you have thicker coils, use spacers. They work for M3 and M4.

Have fun.