I found a ring of fallout on sale for 99$ It's looking good so i challenge myself to reproduce it :D
And this is what i succes to do. I printed it face up. Fit good for my finger but maybe you will need to scale it down or up. I mesure my finger 20mm diameter but i need a 23mm ring to be eable to wear it and be comfortable.

**I found that the background of the gear was a little bit too thin soo i change it in the fallout ring v1.1 and i add same ring but smaller inside 22.5mm.

I add my Autodesk 123d design file to show how i made this and if you want to remake/remix it ...
If you print it, I would enjoy seeing the result. Do not hesitate to give your comments and if you have any suggestions I am ready to make modifications