Use Arachne wall generator or your walls till be too thin and split.

If you have issues with the ring being too tight on the spool, you should print the test print I included to measure the hole and contour accuracy of your printer/slicer. You may need to print the test print I included, and then you can adjust your Hole and Contour X-Y compensation. I set both the Hole and Contour compensation to 0.1mm which is true to size for my machine.

The original ring was too large and would not allow the AMS lid to close, so I reduced the diameter so it would fit. The AMS system only accepts 190mm - 202mm in diameter, so it was 1mm big. I also noticed the studs were slightly off and was pressing against the cardboard spool holes. Additionally, I added a small lip on the outer ring so it will snap into place as you run your thumbs around the outer edge.