Build your own Facemask
1. 3D Print the mask. I suggest printing it upside down from its original orientation. This provides you with the easiest to remove supports. In my tests printing with the mask print with a rafting to prevent a misprint was required. The print is designed to fit snugly on a medium sized head, those with smaller or bigger heads may want to edit the SKP file and uniformly scale the mask by 2% in either direction to obtain a proper fit. Remove supports from the front of the mask and any supports in the screw holes (a drill for the screw holes works well, a chisel for the supports behind the front of the mask)
2. Obtain and Tape a clear plastic sheet to the outside of the mask so that it covers all four holes in the mask and then some on either side. Using a permanent black marker, mark on the sheet where the four holes align and use a single hole punch to make the holes for the mask.
3. Using M3-16mm screws and M3 locking nuts attach the plastic sheet to the mask rim.
4. Using the holes on the ear pieces and the clips provided in the print, use 2 #64 elastic bands to create the back of the mask. The Elastic bands go through holes and attach to the clips on the outside of the mask and hold the elastic bands preventing them from going through the holes in the mask.
Use this mask in conjunction with a N95 mask or homemade mask, a tutorial on how to make this is found here: https://youtu.be/EAj12GKuAEk