lswcap
Amidst a lack of masks around the world, a Russian designer (Evgeny Maslov) has devised a mask made of corrugated cardboard, BUMASK, and is distributing it as a PDF. Just cut and assemble the corrugated cardboard in this form and attach it to your ear. The filter part is interchangeable, and a HEPA filter used for non-woven fabrics, paper napkins, and air purifiers can be used. The secondary mask is still undergoing improvement, and version 2.0 has also appeared.
The advantage of this product is that it can be used continuously by simply replacing the filter. Related information can be found here .
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