After testing multiple "Ear Saver" designs, I found the "Surgical Mask Strap Support by BlackoakStudio", which is shaped by snapping two halfes together, to be the most scalp-friendly.
On the other hand I prefer hooks instead of pins to catch the mask straps.
And two instead of one catching points.
So I made my own version - parametric in OpenSCAD.
Customize the snap-fit and hook positions to your needs by printing a few of these...
=> .scad file in the .zip because of an upload error. <=