Covid Montana mask and high surface area filter frames

thingiverse

Masks designed to safeguard the wearer require a secure seal and effective filter material. Basic cotton masks primarily prevent the wearer from expelling droplets, thereby preventing germs from escaping. However, materials easily accessible for blocking significant virus-sized particles that provide some protection to the wearer can be challenging to breathe through. Revised "Montana Masks" have been modified with larger loops for attaching bands and increased nose room. Mine are printed with TPE near the face to create a flexible seal without using a gasket, but with PLA for fast printing. Montana Masks were designed to utilize filter squares cut from N95 material, which is now reserved for medical workers. New frame designs provide more surface area when using filters like the 'blue shop towel', medical wrap, or layered quilter's cotton, or HEPA filters. Masks can only be as effective as the seal and filter used, so these parts should be scaled to fit the face of the wearer. Any use of this or any other homemade mask is done entirely at the responsibility of the wearer and fabricator. I am just a 3D print guy, not medically trained! These designs have no official medical approval, so use only at your own risk. Scaling for several women has been 85% x 85% y 100% z. For me (and another male), scaling 92% x 105% y 105% z seems to provide the best seal.