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UPDATE 4/20/20: Post-production processing video released:

GoFundMe to help me get mask to hospital in need faster:

This tutorial is for assembly with supplies you can find at local stores.

We have a nationwide PPE shortage as a result of COVID19. I’m ready to distribute this optimized design for free for in-house printing in hospitals and elsewhere. My hospital is buying printers and I know others will benefit from this improved design. I find it more effective than any I have seen so far. It allow a great deal of filtration while still being breathable. The different sizes help you find one that fits your face.

You may use these designs and please share with everyone. You may not sell for profit but may accept donations towards the cost of supplies during the national emergency.

I’m grateful for the work of Kvatthro on thingiverse #4222563. I started with this model and have made many modifications since then. 4/12 version 2 update: I’m also extremely grateful to Everett W. from Nevada for redesigning these with me to all fit the same filter box among many other upgrades. Click the thingiverse link at the top for all the details. I will not update anything else below this line as a new video is coming soon to explain it all.

I’ve calculated average cost per mask+filter to be $1.88
$0.97 PLA + $0.06 3M filter + $0.31 MERV 13 filter + $0.25 glue + $0.29 tourniquet
Silicone can be used to bring cost down compared to cool shot glue gun, but will require drying time and has fumes. I also added a pdf with filter and cost EXAMPLES to my thingiverse page linked above.

This video is for educational use only. Use at your own risk. There are no guarantees about the efficacy of any homemade masks. My ideas are opinions expressed are my own.

Get creative, stay safe. These are okay to use ONLY if you run out of regular masks. These are a last resort, but it’s an attempt to be be the best last resort available. Consider using 5 second hot water submersion and molding to face for more comfortable fit. Also rubber window sealant around the edges can be added IF this is intended for extended wear. Not necessary if this is just being put on for a few minutes while intubating a patient.

3/30/20 UPDATE!!!! ready-to-print gcodes now available for download. These are for a 220 x 220 print bed, only tested and working on my Ender 3’s. I made many combos of desired prints. This eliminates the need for slicing if your printer is identical or similar to mine

Settings are:
0.3 mm layer height
50% infill (walls end up 100%)
200-210C nozzle, 60C print bed (70C for first layer)
speed: 60 mm/s, first 2 layers slower at 30 mm/s (if too fast for your printer, manually slow it down on the printer once you clicked start).
fan 100%
no supports or build plate adhesion

I tried to make combinations of mask and filter together, mask only, filter only, etc etc.
I was very consistent with the labeling so it should be clear.

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