COVID-19 DIY Mask Respirator 3DP Cavity/Core Mold

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This is a DIY project to create N95 masks using household materials with a high Fit Test Score. The files are designed for a 2-part mold that sandwiches materials at high pressure to produce well-fitting masks during the coronavirus shortage. The design was 3D printed on an Ender-3 with 0.5mm layers using a 0.8 nozzle in Hatchbox PLA, which supported several hundred pounds of clamping pressure via standard woodworking clamps. 3-4 Layers of paper towel with a 10:1 Water/PVA solution as a binding agent lightly applied from a spray bottle between layers worked well to form masks. The masks had decent structure but still let some filtered air through via the holes in the mold where little to no pressure was applied, 2 layers of vacuum bags with the same binding agent also worked well. Water/flour mixtures worked okay, but not as well as PVA. It would be great to test a mask molded with vacuum bags or paper towel on a TSI PortaCount Respirator Fit Tester if anyone has access to one. The design really does fit well - good work Silvia Stroe. Silvia Stroe's respirator mask: Mask for Respirator-Free Reanimation Venturi's Valve No guarantees masks made from this mold design have any medical value - it certainly makes you feel safer though. If there are any great ideas for filter materials / binding agents, drop them in the comments and I can test them out.