Hand tools and fabrication machines
I wasn't sure how I wanted to design my ring so I played around with different silhouettes, shapes, and structures on a sheet of paper. I really liked the concept of layers and concentric circles so I started playing around on Tinkercad.
Using 3D modeling software is actually a lot harder than I thought it'd be. It might just have been because I wasn't familiar with the interface yet but I had a lot of trouble aligning the shapes on all three planes. It took a lot of rotating and orienting the workspace to stack the 5 torus rings and 2 cylinders I used in my final design.
"Just because you can 3D print something in one piece doesn't mean you should" - Chris
So this is when I realized my design wasn't exactly ideal for a 3D printer to fabricate in one piece. A lot of support material was needed and the final ring was really rough after I spent 20 minutes picking out all the support and sanding down the surface as much as I could.
If I could redo this ring, I think I'd print it in 5 or 6 different pieces and glue them together so the finished product is a lot smoother. On the bright side, it fit my finger perfectly.