Print is easy, but slow. Used 3mm and 20% infill to reduce time. mass and resources needed. Works out about 6 to 7 hours for the complete mask print time.
On my Ender the mask is strong and snaps together.
Small grill goes permanently into the inside of the mask.
Cap snaps on securely and clips off with a bit of efford, no damage.
Took one of the 3ply face masks and cut out a portion to act as the filter. Works a treat.
Normal elastic to tie/support on your face. I used 5 treat elastic, because I do not have the elestic they recomended.