Everybody that can sew should be making masks now.... (written 4/4/2020)
If you intend to make many masks, a rigid template for tracing and / or cutting can make things easier and faster.
This pattern is for the Olson Mask that we are making.
There many sources for the Olson Mask Pattern, here is one:
https://www.avera.org/app/files/public/76443/Olson-Mask-with-Pattern.pdf
I used the .PDF pattern from Clayton Skouten and Rose Hedges the pattern created here.
Use at least 3 shells to protect the edges against wear.
Any rigid material will work. I use PETG.
The gcode provided is tuned for Overture PETG.
The author hasn't provided the model origin yet.