Sine Ring Bulge

Ring created using Functy. Constructed from 8 parametric curve threads each with a formula similar to the following:

(x, y, z) = ((8.5+((1-cos(8*a*(2*pi)))/2))*cos(a*(2*pi)), (8.5+((1-cos(8*a*(2*pi)))/2))*sin(a*(2*pi)), 2.5*cos(4*a*(2*pi))),

radius = 0.5*(4-cos(8*a*(2*pi)))/5.

The diameter of the ring is 16mm on the inside (size 5½/K½). Send me a message if you'd like me to create a different sized version.