Full Face Snorkeling Mask Respirator Filter Conversion

thingiverse

<h3>Design history</h3> In the summer of 2019, Henry Alfredo pioneered converting a snorkel diving mask into a gasmask: https://www.instagram.com/p/BzDeL8WoGLT/ Now during the Wuhan Virus outbreak, I'm thrilled to see many people also discovered the other use of snorkel masks. Companies have filed for patents since the start of 2020 yet I'm pretty sure I've established prior art. I publicized the design so people can lower their full face respirator costs and refill their own cartridges. This design began as a way to replace my used GP-5 gasmask filters. As such, it can be directly screwed onto the GP-5 mask. This so-called ГОСТ 8762-75 (interstate standard) is a 40mm thread type with a 4mm thread pitch. I have used the 3D printed filter with new activated carbon extensively during spray painting indoors. <h3>Design updates</h3> DOP_4 is preferred over DOP_3. Added a chamfer for comfort. Removed the inner seating ridge for the 5/4" rubber for a cleaner print. CAP_4 is the preferred bottom screw cap after printing it in 200 microns. It also has chamfered edges. CAP_3 is too tight, and CAP_2 is a bit loose. I kept them included in case you need a tighter or looser fit depending on your outcome. <h3>Convert your snorkeling mask into a respirator.</h3> The filter has a substantial volume that can be filled with any material at hand. Note that activated carbon does not filter out viruses. The rubber 5/4" gasket ensures an airtight seal. This is commonly available at the hardware store. I've already made an adapter for the noname brand snorkeling mask, and will make one for the Decathlon mask soon. <h3>Printing instructions (WIP)</h3> Preferably print in ABS and seal with acetone to keep all parts clean and airtight. CAP_4 has a tendency to warp in ABS, so add at least a 5-7mm brim. All parts with threads should be printed in 200 micron layer heights. The rest can be printed in 300 microns (although 200 is better). No support is needed on any part. FILTER_DOP_4 ideally should be printed in TPU. <h3>Assembly instructions (WIP)</h3> Drop some acetone into CAP_4 and roll it around near the threaded edge, brushing excess acetone along the threads. Same goes for DOP_4. After you have used acetone to join the threads and sealed all the prints, leave them for at least an hour to dry. Don't try to acetone two sides of a print at once; it will leave ugly fingermarks. If GASMASKER_FILTER_5 and CAP_4 encounter any issues, please refer to the troubleshooting guide. <h3>Viral Filter concept</h3> Still researching. If you're unsure about your HEPA vacuum cleaner bag's safety, don't use it. https://smartairfilters.com/en/blog/best-materials-make-diy-face-mask-virus/ https://smartairfilters.com/en/blog/paper-towel-effective-against-viruses-diy-mask/ https://smartairfilters.com/en/blog/diy-homemade-mask-protect-virus-coronavirus/ https://www.consumer.org.hk/ws_en/news/2020/covid-19-diymasks?fbclid=IwAR3kJO1b4vFGtmijvE_sRvVUN7OHaX1YyiGnJNYkAE9zd49SlJ0A0_RPVVo https://www.businessinsider.nl/homemade-mask-using-hydro-knit-shop-towel-filters-better-2020-4?international=true&r=US <h3>Sanitation instructions (WIP)</h3> An hour-long 65°C dishwasher cycle on ABS parts works fine. Parts in ABS probably won't hold in autoclave temperatures above 90°C due to deformation. It seems ABS doesn't tolerate bleach very well, so the dishwashing machine or hand-washing with soap and water is recommended. Clean all parts thoroughly before inserting new filter material. Preferably store them in a sealed bag when not in use. <h3>Disclaimer</h3> Use at your own risk. Depending on the pressure drop of how you stuffed the filter, usage duration should be limited. Advised not to use it alone.