Filter Mask
Description
This is a more simple, and faster build than my last. Also, much more comfortable for people who don't like straps around the ears. Print two MaskInserts & MaskSnapFlannels. Other parts are optional. "Flannel" parts just allow for more material thickness, and are appropriate for tee shirt material. You'll need filter material (I like tee shirt best) and less than 30 inches of 1/4 inch elastic strap. I cut a rectangle of filter material about 25 cm x 15 cm. Fold the edges in a fan pattern (see picture), and bend around the sharp edge of the insert. Hold it all in place while sliding the snap over it all. If you use thicker filter material, or double up with tee shirt material, you might have to increase the scale of the snap. Stretch the elastic to pull over your head. The upper band angles high over the ears, around the back of the head. The lower band below the ears, around the back of the head. Adjust the elastic thru the buckles and snip off dangling excess. This mask seems to fit all the heads in our family. Now to test under working conditions. Stay tuned. Just added the quick release buckle. It's not essential. But, for those who don't want to mess up hair, etc... Print two females & two males. Cut elastic straps in half, and insert buckles at mid-point so that they rest at the back of the head. The buckles are small. So, I really reduced print speed to get them to come out nicely. 4/20/2020 - Update. Paper filters work well for 1 to 2 hours. But, under heavy workload, the moisture degrades the material. So, we've tried flannel and cotton tee shirts. I like tees the best. My son complains about his breath fogging his glasses with this style of mask. So, I'll upload a clip that fastens to the outside of the filter, and hugs the curve of the nose. 4/21/2020 - Uploaded nose clip. Heat in shallow water in microwave for 30 sec, and bend to shape of nose. Put clip on outside of filter, and insert pins to hold in place. The idea is to keep the plastic away from the skin for comfort. If filter clips deform after a couple of days, just reheat as above, and reshape. BTW... This design works well for our various face shapes & sizes. Replacing filter & reassembly is pretty easy. So, I'm sticking with this design for our family. 4/23/2020 - I had one set of filter clips weaken over repeated use (including heating and reforming once.) So, the clips have a limited life span. I replaced the filter on my own mask about 4 times without issue. 7/13/20 - Still works great. Use almost daily.
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