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3M N95 masks captured over 95% of particles down to 0.007 microns. That’s over 10 times smaller than the coronavirus. What might be surprising to some is that the surgical mask was able to capture 80% of the tiny particles...

Here is where that maks fails - in the fitting. If the mask does not provide a solid SEAL against the face, air moves in around the mask.

The ideal mask provides the mentioned level of filtration, makes a solid seal on the face, is easily replaceable and in the long term, is not expensive. Currently, I have found these types of masks costing $10 for a two pack. Even if you dispose and replace once per week, a couple months supply starts to approach $100.

This is where I see an opportunity and I am using my 3d printer to develop a mask that is low cost (target $30 to $35), that provides HEPA 13 or better filtration, can easily replace the filters at a minimum cost, and is chemically resistant to detergent / sanitation / dishwasher safe. Yes they would be initially more expensive, but would last multiple years, and the filters could be even made at home but cutting up a standard HEPA house filter.

Here is where that maks fails - in the fitting. If the mask does not provide a solid SEAL against the face, air moves in around the mask.

The article it deals with that.

This is where I see an opportunity and I am using my 3d printer to develop a mask that is low cost (target $30 to $35), that provides HEPA 13 or better filtration,

What about the Tyvek used in shopping bags? It is barely breathable, so you need forced air to use it, but it would be cheap.