3M respirator diy replacement filter Covid-19
thingiverse
Replacement filter for 3m Respirator using Roomba 700 Hepa cartridges. Filters are in short supply with the virus pandemic. this will allow you to replace filters on 3m and other masks with Roomba 700 Hepa Filter cartridges for about $1 a piece. Filters available here https://amzn.to/2R7jLqZ
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