Has anyone besides me seen this site?

A Mask For All: requires a 3D printer

I don't know who has a 3D printer where I am ...
having said that:
this thing you can download, for free if I get this right,
and the 3D printer will make it
and you assemble it.
The mask frame has a place where you can insert filter material,
thus you can clean the mask when not in used,
and replace a used mask filter with a new clean one.

What do you all think?