Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4279140.

UPDATE... V2 print with 1.8mm shells, no top/bottom/infill... faster and more durable should be 1.8mm thick...

Seen a few, combined a few ideas... not the fastest or smallest design but should be comfortable and durable and a very good "multi-fit" even with ponytail

3 shells @ 0.6 line width

OR FASTER with a 0.8 nozzle print at 0.9 line width

1.8mm walls and 0.3 layers... bump up speed, temp and flow to suit but also to make sure the walls join securely...

ZERO infill/top/bottom needed

please let me know how they go and share around if you like