For the second ring I still went somewhat with the fold scheme. I modeled a simple ring. it has a fold line at the center with various depth. After I thought about how to model this design for the last two weeks it was actually pretty simple do get it to work at the end. Just drew the outlines and some cross sections and created the inner and outer closed loops with a 2 rail sweep. The sharp edges were bend by a bit to make it more comfortable. I am curious to see how this actually feels on a finger.
I think I will model one more design before I sent it off to the 3D printer.