I put 4 rings in one file to reduce trial and error when printing different size rings. Also, this allows you to swap out rings if your fingers are swollen, etc.
Sizes of rings are (diameter x height):
25 x 4 mm (Original)
24.5 x 3.9 mm
24 x 3.8 mm
23.5 x 3.75 mm
The author remixed this model.
The original size was slightly too big. I added 3 variants, each scaled down ~0.5 mm.