3M 7891 Cartridge Holder Filter Adapter
thingiverse
Adapter ring to let you make DIY filters These do not provide the same level of protection as a proper filter from 3M, but will give decent filtration from later particles like paint or dust. I used a standard 3ply surgical mask as the filter material. Stretch the mask material over the 7891, then press the printed part down over the filter and 7891. This will create a friction fit between the 7891 and the printed part. Finally trim away excess mask material with a knife
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