COVID-Pandemic-Mask: Filter Box Inserts

thingiverse

I made a minor improvement to ctwiles' COVID Pandemic Mask design by creating a "filter-box-insert" which press-fits the filter medium in place, creating an air-tight seal. This press-fit insert makes assembly easier, requiring no hot-glue at all. It also makes it much simpler to remove and replace the filter as needed. Since this insert is a tight fit, depending on the thickness of your filter material, it may slightly deform the filter box, pushing it outwards. This can prevent the filter box from clipping onto the main mask body as securely as normal. I added a rubber band that attaches around the existing mounting points to ensure the filter box stays secure. Insert design: The X and Y dimensions are 1mm smaller than the inner dimensions of the filter box they are supposed to insert into, providing for 0.5mm clearance on all sides - this is where the filter material resides. The Z dimension is 5 mm for all mask sizes. I made no changes to the mask design or filter box design; this is meant to be used with the original filter boxes and masks found at https://www.thingiverse.com/thing:4237783