diy Face Mask

This is a filter remix of the Montana Mask attributed to the Billings Institute by an upload made by KLambert to the NIH 3D Print Exchange:
https://3dprint.nih.gov/discover/3dpx-013312
The face Mask part is pretty good, but the insert for the filter was incomplete and incorrectly sized.
This post includes the facemask component from that post as well as my own design for the filter holder inserts.
The inserts are designed for both cloth as well as a more rigid filter material. It is in 2 parts with an inner part that fits into the outer part. Keep in mind the tolerances can be tight, but I tried to size for cloth use.
The filter material is up to you, but from what I have seen looking around online one can use the cloth from a 100% cotton T-shirt. This design allows for 2 layers as well as an included rigid part if you can find some filter material.

It can be printed in PLA or ABS or PETG, but I printed the face mask using TPU. TPU flexs and makes for a good fit with a good se