Respirator

thingiverse

READ BEFORE USE!!! Hi there! I've created this mask for individuals who don't have a commercial respirator but want to create one themselves. ALL USES ARE AT YOUR OWN RISK! This mask has not been tested, so it's essential how well you make it. The mask comes in two sizes: M and L - the M size is designed for average people. Print it with flexfill 98A or a similar flexible material. I printed mine on the flat side with supports only, at a 30° overhang, two perimeters, five bottom and top layers, and 40% infill. After printing, finish it well with a sharp knife to ensure the threads and face rim are clear of warps or overhanging material. This is crucial: TEST YOUR MASK! Put it on your face and cover all inlet holes tightly. Take a deep breath - if you can get any air, something's wrong. You can add sealing tape to the rim and increase the seal, but test it repeatedly, even while wearing it. The outlet membrane was printed with flexfill as well. Secure it with an M3 bolt and nut or similar. I highly recommend adding a piece of protection fiber from the inside, just like in the picture above - this is to protect others from you. This part isn't working perfectly, but it's there to save filters while breathing out. There's plenty of room for improvement. The filters were printed with PETG. The grid must be placed with its flat side facing outwards to offset the filtering material from the inlet hole. Otherwise, you'll have low airflow and an unusable mask. Filters are designed to use 4-5 cosmetic cotton pads for easy replacement after each use. I used four with a layer of vacuum cleaner bag fiber, but you can add paper, cotton, coal, copper sawdust, or anything else that works. The complete mask is tightened to your head with two flat rubber strips. There's also a tightening clip part; use it as you wish, but always tighten it well to your head and test it before each use. I've uploaded step files for filters and f3d files for masks (exporting to step was unsuccessful, sorry). Feel free to modify them to suit your needs - my goal is to help someone with this project. Good luck in these challenging times! edit1: My first testing - a trip to the store and back. Four pads plus microfiber in each filter were too many. I didn't get enough air, so I redid the plastic grid twice and used only three pads. Now it seems much better. New filter covers added. Lube for thread between filter and filter cover is recommended.