Ear savers make wearing facemasks for a whole shift tolerable.

Fast print and I can fit 12 of them on one build plate. I am cranking them out by the dozens now in the evening.
Disclaimer: I tried the mini ear savers out for some time, but found them to be too tight for my head (which is not the smallest). So print the original file from Mark for a much looser fit (see below).

The mini ear savers are a smaller version of Mark Rehorsts ear savers: https://drmrehorst.blogspot.com/2020/04/covid-19-printing-projects.html

Print instructions

Use PETG