Model originally uploaded to Thingiverse at https://www.thingiverse.com/thing:4249810.
This is a re-mix of the Montana Mask designed to stretch out N95 breathing masks for health-care workers. Please make these and provide them the healthcare workers who need them. It allows a standard surgical mask to be cut into 6 pieces and inserted into the re-usable / washable 3D printed mask.
The original Montana Mask is suppose to be printed with rigid plastic, like PLA or ABS. I got it to print in TPU, but made this version to save on the flexible filament and increase print speed by going half with PLA. In order to reduce the chances of mis-loading the flexible filament, I did a straight across transition instead of a curved one. That brings it down to exactly 1 filament change.
Added new Zig Zag version. This will be harder to print, as it requires several layers of transition, but should make the flexible and rigid parts adhere better, as I found they can separate when squished. I have separate parts for the borders, which should be done with 100% infill.