Gill respirator pleated filter half

thingiverse

Pleated filter frame for the Gill respirator. Makes the filter area about 180% of a flat filter. This makes a huge difference in breathability. Make 2 halves and mate them together with a filter in between. Filter should be as long as an un-pleated surgical mask is wide and a little wider than the frame. It helps if one half is flexible. Either print a half in TPU or sink the file into the base of your slicer to make it thinner.