This is a Spool Holder designed for 250g Spools. I designed this after Printing a Model from Makerworld where the two outer rims had different diameters. This annoyed me so i designed one on my own.
Features:
Hub Diameter of Spool 50mm or larger
Spacers to adjust the width, covers the full range that fits in the AMS
Higbe threads on both parts for very easy thread start
For bigger hubs, you can print a centering sleeve or adjust the spacer rings with a centering lip.