4 Filter Mask by jedsmith

Last crawled date: 3 years ago

Summary / Notes
Disclaimer:
• There are no guarantees about the efficacy of any home made masks. Use at your own risk. Get creative, stay safe. These are okay to use per CDC ONLY if you run out of other approved masks. Though the goal is to reach and exceed n95 level of filtration, this has not yet been confirmed. These are a last resort mask, considered equivalent to a scarf. You have to be the one to choose what you wear and I am not responsible for any negative outcomes if you choose to use this. The info here is for educational use only.
This is a large a cloogey mask. I designed it taking account of the following considerations:
• You can get reusable 3M respirators that work with the filters I mention under the “required” list below, but they only allow 2 filters. I wanted to have 4 to allow easier inhalation.
• In California, you are not allowed to have an exhalation valve in places like stores, etc. (an understandable attempt to slow the spread) so again, because the 3M respirators have exhalation valves, another reason to design my own.
• Even with 4 of these filters I find I can only wear this mask comfortably for about 30 minutes. Your mileage may vary.
• The from filter covering (parts F and G) are to allow you to rest the mask without damaging the filter medium. You could always replace parts E, F and G with another print of part D if you like.
• Yes- it looks ridiculous- you’ll get funny looks. But it works for me. Perhaps it will for you.
Usage Considerations
• Again, it looks pretty funny
• Do your own research but my take on the filters is that they might lose effectiveness if:
o Washed
o Sprayed with alcohol
• So you make want to create 3 or masks and quarantine each one after use for an appropriate period of time
• Again, it looks silly/ funny
• It’s difficult to talk with one of these on.
Parts List
A. (1 ea.) Mask (large and medium included)
B. (1 ea.) Air exchange compartment
C. (2 ea.) Side filter holders
D. (1 ea.) Bottom filter holder
E. (1 ea.) Filter box connector
F. (1 ea.) Filter box – bottom
G. (1 ea.) Filter box – cover
Required
• 3M filters
o Most important! You can get them with the N95 or N100 standard – here is a link on Amazon in the US (try searching for “2071” or N100) - https://www.amazon.com/gp/product/B00JE6V22Q/ref=ppx_yo_dt_b_search_asin_image?ie=UTF8&psc=1
• Hot glue gun/ glue sticks (on Amazon here - https://www.amazon.com/gp/product/B0768MGL5L/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1#HLCXComparisonWidget_feature_div)
• Rubber door sealant
o This is for sealing the mask against your face this one from Amazon feel great against the face (link on US Amazon here: https://www.amazon.com/gp/product/B07BBTFXQV/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1)
• Rubber gloves or thin rubber
o This is to create a seal/gasket between the 3M filter discs and the holders you print
• Elastic
o To fasten the mask to your face. For upper elastic I suggest using this material as it covers the top of your head and supports the weight of the mask better (a bit pricey so you can try the regular elastic). https://www.amazon.com/gp/product/B08B42H599/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
o For the bottom of the mask I suggest something like this, also available on Amazon- https://www.amazon.com/gp/product/B0876T4LBS/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1
Instructions
Order/ obtain the items listed under “required”
Print the parts – including both the “large” and “medium” versions of part “A”. I used PLA but I’m sure PTEG or some other material will do. Note that the only part that needs more than one is part “C” (you’ll need 2 of them).
Use the rubber door insulating strip to line the both the large version and medium version of part “A”.
See which version of part “A” fits you best with the rubber sealant installed in them. Go with that.
Glue all the parts together using the lettered diagram as a guide. DO NOT GLUE PART G TO PART F. Part G is a “snap on” cover and is place on part F after the filter has been placed.
Use the printed item “Gasket Stencil” to draw on rubber gloves etc. and carefully cut out 4 rubber gaskets from a rubber glove, etc.
Place the cut out gaskets on parts C, D and F.
Place your filters on parts C (you will have printed 2 parts for C), D and F.
Carefully place filter cover "G" over filter part "F".
Use your elastic to thread through the loops in part “A”
Your mask is now ready to wear!