This is a work in progress simply because I have not tested it. I bought some flexible filament to try to print this with and never got it to work well. I never went back to print it in something easier. If you print one, please post a picture for others to see.

Use the 20 degree test to tune your overhang or support parameters then print the whole thing. If a full revolution won't fit on the plate (it will on my Prusa i3), then print the half and splint it together with filament and glue.