These are not intended to replace N95 respirators. They are only intended to be a hopefully better “plan B” if, God forbid, medical workers are left with only a handkerchief to protect themselves from COVID-19. This is a 3D-printable respirator backup plan. If you have access to N95 respirators, wear those instead.
This is *not* a Keith’s Test Garage project. I’m just the only volunteer who had a website. We are currently producing these for a specific hospital, but we are making the in-progress STL files available below in case anyone wants to test them, improve them, etc.
Over the past few days, we’ve been collaborating directly with a hospital to build a 3D-printable handkerchief alternative with the following considerations:
- Reliable seal around the face, even when moving around
- Uses HEPA filter media, yet easy to breathe through & communicate
- Easy to print
- Reasonably comfortable for long periods of time
- Feasible to deploy from the community to the hospital in large numbers
This is a work-in-progress. We will update the design based on continued feedback from the hospital.
This model has not been approved by any regulatory agency. Use it at your own risk, and only as a last resort, if you do not have any other homologated protection. The recommended measures to protect yourself from infection with the coronavirus COVID-19 are the following:
• Stay home and avoid contact with other people
• Avoid touching your face with your hands
• Wash your hands very often
See https://www.cdc.gov/coronavirus/2019-ncov/ for more information about protecting yourself from COV-19.
Changes We Made
- Enlarged filter area to allow usage of HEPA filter media & improve breathability
- Increased strap hole size to allow 1/2″ and 3/4″ elastic for a comfortable, secure fit.
- Mounted filter outside to reduce risk of inhaling fibers from the cut filter
Origins / Credits
Some volunteers are printing the plastic, some are installing the straps, some are installing the foam rubber, but the hospital clinics & physicians will be installing the filters and conducting Qualitative Fit Testing.
Various Prototypes & Iterations
Here are a few 3D printable respirator masks we tried/modified/tested/hacked over the past few days.
Explain “we” and “our.”
Since I typically fly solo on this channel, the “we” requires an explanation.
I’m primarily referring to Matt Winder, Matt Havens, and I, as we did the up-front prototyping and coordination with the hospital. During that time, several others have been giving input, challenging ideas, testing prototypes, and preparing their printers to start cranking out 3D-printed respirator masks. Now that we have approval, the larger team is ready to go.
While you’re here…