I modified the RC3 version to make it even smaller in height, which saves about 1/3 Filament per print.

Logos/Texts are also removed for higher printig speeds.
Print 2 complete Shields (Headband & Bottom) in under 2 hours!

Update
I've created a 8x-stack. <250g Filament for 8 full sets, so you can get 32 full face masks out of one Filament Spool!
I've also improved the Support-Structure, so it won't fall over

Print instructions

Supports are not necessary.
Print with at least 3 perimeters, about 30% infill.

Ideally, print it from PETG.