M17 / M17A1 Gas Mask Filter Blank / Insert
Description
The size and proportions of the original blank/insert model didn't fit my M17A1 gasmask. This is a complete redesign based on measurements from the M17-A2 filters that were included. I've added an air channel leading from the external opening to where the air exits the filter pouches. The should prevent the rubber from sealing up around the back side of the opening and creating a breathing restriction. I wasn't able to figure out how to properly curve a surface in FreeCAD. I used two ellipsoids to cut the top and bottom of a pad to simulate the curved surfaces. Needless to say this kludge required a painful amount of trial-and-error to get both the dimensions and positions spot-on. I welcome a remix, or even just a comment with guidance, if anyone here knows how to properly curve surfaces in FreeCAD.
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