Boost your pyromancies with the Great Swamp Ring from Dark Souls 3!
The ring's inner diameter is about 22mm, so you may have to scale it to your size.
Model was made in Blender, using the in-game icon for reference.
A lower layer height results in a better looking model, but at 0.06mm, it takes about 40 minutes to print. Try to find the lowest height with a print time you find acceptable.