US RING SIZER 17 - 24
thingiverse
Rings to estimate US Ring size for ring sizes 17 to 24 in steps of 1 size. Also a Ring Sizer rod / mandrel to go with this size rings. Typically ring sizers go up to US 13 or maybe US 16. I determined the equation for US Ring size as a function of circumference (in mm) by fitting a straight line through the data in the table on Wikipedias listing for Ring Size. The equation I determined is: US Ring size = Circumference (mm) x 0.391599 - 14.311494. This gives Circumference (in mm) = US Ring Size x 2.553633 + 36.5462.I made the rings with a rectangle profile 2.5mm x 2.00mm with 0.5 mm fillets. This profile seemed easier to print than the full round profile.
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