HEPA Mask - Roomba filter cartridge

thingiverse

Since N95 masks can't be found, a lot of people are making their own, some using cut up HEPA filters and cloth for filter material. I thought I might have found a filter cartridge that would work as-is, and it seems to. These are Roomba i7 replacement filters, available from Amazon. There is a dual sided mask, a single sided mask, and a mask with a single filter centered in front. For best results, print the main part in PLA and heat it with a blow dryer to form it to your face, print the rings in PETG for superior layer adhesion. I used some adhesive backed extruded foam to form a seal around the back. It can be purchased via McmasterCarr. I will add links to the components as I have time. SEAL the surface of the mask prior to use! Surface filler like Bondo glaze putty and an acrylic paint will work well. Update 04/07/20: Added an insert to address concerns regarding HEPA filter fibers being inhaled. I believe if the filters pass HEPA certification they ought not shed fibers, as those would also cause a test failure, however without further testing I would rather simply add the part and mitigate the risk. Besides, I aim to please. ;) Update 04/13/20: Added several screnshots of what I believe to be the best orientation for the double filter mask. These shots are with 60degree support angle, and it printed beautifully. Note: this device has not been evaluated by the FDA. I make no claims regarding its ability to prevent or treat any disease. It is provided free of charge, use at your own risk.