Snug Fitting Filter Mask II

thingiverse

This mask features a set of flexible fingers that press filter material snugly against your face to prevent leaks. The large filter area both makes breathing easier and reduces the back pressure to minimize any leakage airflow. The filter is held in place around the perimeter with a rubber band so you can easily replace the filter. There is also a removable rib that keeps the filter material away from your face. This mask should fit a wide variety of face shapes, but can be further customized by scaling the X and/or Y axes by up to +/-10% It required a piece of filter material (old t-shirt, microfiber cloth, or cotton dishcloth) 7.5" in diameter, and a piece of 1/2" wide elastic about 22" long. **ASSEMBLY** In addition to the printed parts, you will need a 7.5" diameter piece of filter cloth (I used a double layer of cotton t-shirt material), a 22" length of 1/2" wide elastic, and a rubber band. Before adding the filter cloth, first thread the elastic strap into the buckles on either side of the mask. The easiest way I've found to fit the filter cloth is to first overlap the top edge of the material over the top two anchor points at the nose and loop the rubber band into the two notches. Then overlap the bottom edge of the material over the bottom anchor point and loop the other end of the rubber band over that. Then 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. Next, poke the excess material into the mask and snap the rib piece into the notches on either side of the inside of the mask. The material is pinched between the end of teh rib and the mask frame.