Designed these to help organize various funnels I have  printed.  Inside diameter is 25mm and outside diameter is 54mm.

Has push fit connectors to use with snaps.  I used the moderate weight bearing snaps found here ----> https://thangs.com/designer/MultiBuild/3d-model/Raised%20Moderate%20Weight-Bearing%20Snap-989145

Printed with 3 walls and 15% infill -no supports.