Hi Gary - Welcome to MoI.

I also use MoI in my jewelry business. Not for manufacturing, but for visualization:

https://www.keyshot.com/2011/cascadia-design-studio-custom-titanium-ring-design-with-moi-and-keyshot/

I assume you'll use STL file format for your 3D printing. There are programs available that test if your STL file is valid for printing. I've made some 3D prints from MoI (not jewelry) and they have always worked.

I see no reason your lofted rings would not work. As long as MoI shows the object is a solid, it should print fine.

Ed Ferguson