Openscad design built on Raphael Luckom's openscad bezier library and leaf example. If you want to tweak the openscad design you will need to get a copy of his functions from github. Be warned, the openscad rendering is computationally intensive!

Had to add a solid lower inner circle and thicken the leaves over my original attempt in order to get print stability.

STL file is designed for my head dimensions.