Covid Mask Remix

Fusion360 models added for your convenience. Have fun.

I wanted to improve a few things I had noticed with other mask designs that I had tried out:
1. long-term durability
a. walls are significantly thicker than some of the first designs I pulled off this site
b. increases print time, but makes a part which will stand up to daily wear over several months
2. ease of changing filter
a. filter is a 40mm dia circular piece of non-woven polypropylene cloth (moisture barrier)
b. 1 or 2 filters are placed in cap and cap is screwed onto mask body
c. no need for fasteners (as with my first attempt at redesign) or snap-together parts (which have high-stress and require careful machine tuning)
3. long-term comfort
a. This design has been tested for all-day wear indoors and outdoors for several weeks straight. No fatigue or discomfort noted.
b. this design requires a thin strip of self-adhesive foam window/door seal around its perimeter. This dramatically improve