Filter Face mask

Remixed from: https://www.thingiverse.com/thing:4222563 I altered the dimensions of the filter holder to better optimize the material I am using as well as the way the material is held. I am using a MERV-16 rated filter which has 6" pleats which I cut to 3". By making the grill on the mask slightly smaller, it pinches the material over the edges. I also added a step inside the grill so the filter material is pressed backward as well as pinched on the side. I felt I could assemble the masks much faster this way rather than gluing in the filter material. The cover is the same for both mask sizes. All the same dis-claimers of the original design apply.