3d printed functional gas mask filter

fully functional (probably better than the original), fits eastern block style gas mask (maybe some others too, and since these are step files you can just change the screw to fit others)

the design uses 2 HEPA filters (+ 1 sponge screen included to one of the filters) and about 250g (i havent measured probably a little more) of active coal, it is way less restrictive than the original filter i had, this should protect your lungs from all kind off shit as its similar construction to a modern filter.

the 2 HEPA filters are from a vacum cleaner (Concept VP4360/VP4370/VP4380, SENCOR SVX 048HF SVC 9879BK HEPA)

the material should be something fairly resistant to chemicals, i used ABS and you should close the leaks (the design is kinda modular so this will happen) the more important leak to seal is the upper between the main and screw, the lower should be sealed too but its only for the air to come through the first filter (there is an other so its basically to prorect the coal from thi