Snug Fitting Filter Mask II

thingiverse

This mask boasts a set of flexible fingers that firmly press filter material against your face to prevent any leaks from occurring. The large filter area greatly improves breathing by reducing back pressure, thereby minimizing leakage airflow. The filter remains securely in place around the perimeter with a rubber band, making it easy to replace when needed. A removable rib keeps the filter material away from your face for added comfort. This mask should fit a wide variety of face shapes and can be further customized by scaling the X and/or Y axes up to +/-10% if desired. To assemble this mask, you will need a 7.5" diameter piece of filter cloth (such as an old t-shirt or microfiber cloth), a 22" length of 1/2" wide elastic, and a rubber band. Before adding the filter cloth, thread the elastic strap into the buckles on either side of the mask. Then, overlap the top edge of the material over the top two anchor points at the nose and loop the rubber band into the notches. Next, overlap the bottom edge of the material over the bottom anchor point and loop the other end of the rubber band over that. Work your way around the perimeter overlapping the edge of the material with each anchor point and then pull the rubber band over each as you go. Finally, poke the excess material into the mask and snap the rib piece into the notches on either side of the inside of the mask, pinching the material between the end of the rib and the mask frame.