furnace filter mod for Montana/Texas mask

furnace filter mod for Montana/Texas mask

cults3d

This is an extended version of the cover for the montana COVID mask. It also blocks some of the top part of the opening for the square furnace filter. By using pleated material I can fit 10x as much, and it makes it much easier to breathe. Based on the texas style from here:https://github.com/blackbear/make-the-masks

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