Mask can be used with HEPA filter or you can print the provided frames for building any other DIY filter (with cotton disks, for instance). You can use acetate (or any transparent plastic from a diposable bottle or an office folder) to make the "glass" cuts. Once fitted, glass can be sealed with silicone. **A PDF file is included for printing the acetate (or plastic) cuts for the glass** Headbands can be replaced with elastic fabric.
Even thought it´s not medical grade and has not certification of any kind, this mask can be used as protection against COVIR-19 when you don´t have any other option. Use at your own risk. **Don´t hesitate to print this mask for you, or to provide to whoever you think may need it.**
Remixed from https://www.thingiverse.com/thing:4167649 and https://www.thingiverse.com/thing:4150687