This post is one of many about DIY/Open Source PPE. The full list is here.
Stephen Black: this is described by the Navy as being a Facemask. It is, actually, the headband for a face shield. Other than that, the information is excellent and clear.
This file is full of information, 3D files, STL, DXFs and 100% scale DXFs , which allow for lasercutting. Also,100% scale PDFs that allow anyone with a printer to cut parts by hand. https://www.navair.navy.mil/am
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