Here are some pre-scaled lantern rings set to US standard sizes.
You can find my other lantern rings:
I printed mine using High Definition setting in Cura (Lulzbot Edition). It took about 3g of ABS and 45 minutes.
There is a section near the top that may suffer some some bridging, simply sanding the inside of the ring removed any imperfections.
Add some enamel in the cavities on the face to clean things up even further.
I started with the size 11 ring and modeled for myself.
I created a base ring and left the face last to design, that was so that it would be easy to make all of the lantern rings. I then scaled to each ring size relative to size 11.