3M face mask respirator plug/cap part 6880

thingiverse

This part screws onto the bayonet connector on 3M respirator/face masks, securing it firmly in place. As shown in the photos, this adapter is used successfully on a 3M 7502 model, but it can be adapted for use with ANY mask featuring the 3M bayonet connector. By utilizing this part, you can reduce the number of filters/cartridges required from two to one, which becomes crucial during times of shortage. This means that twice as many individuals can be outfitted with filters/cartridges, making it a valuable resource in emergency situations. For those seeking an alternative to 3M's part number 6880, this adapter serves the same purpose and offers a viable solution. However, due to the ongoing COVID-19 pandemic, sourcing this part from suppliers that offer 3M products has proven challenging. To ensure its effectiveness, I have personally tested the part by connecting two onto my mask and attempting to breathe through it, resulting in failure to do so. This test indicates that no or very little air leaks past the seal, suggesting a secure fit. It is essential to note, however, that this method does not provide a quantitative measurement of the seal's quality. To guarantee your safety, I strongly advise testing your printed part using the same method or an even more accurate one if available. For liability reasons, I do not promise that these adapters will be airtight; instead, I recommend verifying their effectiveness through personal testing. Your mileage may vary, and it is crucial to remember that these adapters are not guaranteed to protect you from environmental hazards. To ensure proper printing, orient the part with the opening of the cap pointing upward and the flat surface lying flat on your build surface. This configuration requires internal supports for the bayonet connector to print correctly. These supports can be easily removed post-printing and require minimal filament. For optimal results, print this adapter using PETG or ABS materials, which offer strong layer adhesion. I suggest avoiding PLA as it may not provide the necessary durability.