I'm printing this later today for a student. I chose this flower because all the roses I found did not print on a ring very easily due to thin walls at small scales. This solid flower model made for a nice rose-substitute to print for a student that wanted a rose ring.

I sliced off the bottom to create a flat side to allow printing of the ring vertically. I am going to print with rafts and supports so we'll see how it goes.

The inner diameter is about 12mm since it is for a 7 year-old girl.