Sundstrom SR 900 mask adapter for 3M filters
thingiverse
Simple adapter to attach popular 3M P3 filters. Adapter is printed from 2 separate parts for easier print and then glued toogether (superglue, acetone). Oring cut from ~1mm gum to seal 3M filter. This mix is lighter than mask with original filter adapter. It weight 116 grams and original mask 135g (without filter). It is also shorter. I choosed this mask mainly becouse it use only one filter where many other need two. There is big shortage of protective supply all over the world so for personal (private) use this mask is perfect (lets dont mention filters high prices). Design is very tight so I will attach STEP file if You will need to correct some dimensions. Everything must fit perfectly ofcourse. No leaking. Printed parts need small file polishing or fine sanding paper preparation, mostly in sealing areas to make orange membranes fit perfectly.
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