Montana Mask Edit

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This is a redesign of the popular "Montana Mask" created by Dr. Dusty Richardson, Dr. Specer Zaugg, and Colton Zaugg found at https://www.makethemasks.com. It tackles the issue of jamming a filter into a square hole, potentially damaging the filter in the process. To use this design simply place a 3-inch diameter filter over the hole, secure it with the filter retention body, and screw on the cap to create a tight seal. Edit: V1.2 maintains the same overall design but increases the diameter of the breathing hole from 4.0cm to 5.2cm, effectively boosting the filter surface area by 70%. Edit: V1.3 expands the diameter of the breathing hole again to 6.2cm for easier air flow and enlarges the hole size for the straps. Note that parts from different versions will not work together. Special thanks go out to u/hazeldazel and u/PonderingWalnut on Reddit for helping verify v1.3.