Flower measures about 22mm tall. Hole for hardware is 2mm. This print profile is with PETG and a 0.4mm nozzle because that's all I have available at the moment, but would probably look better done in a 0.2mm nozzle.
It would nice to have these to be able to add a post to the back though. I don't always like the dangle and could make them a little smaller in scale and add a metal/plastic post to the back after the print. Would be really cute post earrings!