Reusable gas mask filter - 40mm thread
thingiverse
You can use hepa filter + activated charcoal. For working in a dusty environment, this will work perfectly: D Tested on: Czech CM-3 Czech CM-4 Polish MC-1 Polish OM-14 Faser 03/23/2020 Added Grid for cover - you can choose to use ring or grid for holding filter in place. 03/25/2020 Added test threads for GOST and NATO. If the NATO fits, I will make a filter for masks with NATO threads too. However, I don't have any masks with NATO thread standard, so I cannot guarantee compatibility. Thanks to https://www.thingiverse.com/lukewd/about for the test print of NATO threaded filter. 03/26/2020 Added a wrench to help unscrew the cover. 03/27/2020 Added Top grid 2 and Bottom grid 2 with different patterns for those who have trouble printing fine mesh.
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