Updated 12/30/2023: Reworked threads to allow the two halves to close fully.

Update: Due to dimensional differences with each half, I have uploaded a corrected file.

This assembly will allow you to use the 250kg mini spools in your AMS. Just use the supplied bushings on each side and screw together.

You can also use this on full size filament spool with at least a 51mm id.