Breathable Filter case for 2091/2097 filter of 3M Mask (Glue-free)
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**UPDATE**：About the opening part is kind of too thin, @bsfiosco made a remix, I would recommend you to use his work to replace my part. (the one named 20200204_Cap_盖子.stl) https://www.thingiverse.com/thing:4239525 **Please note the Bottom part size is only for 6200 masks. **If you are using another mask you might need to do some tinny alter of the hole on that part, in order to make it fit well. ______________________ Designed because of the new Coronavirus virus. Glue-free installation. Support-free Printing
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