Reusable Mask Frame_MTB

thingiverse

This is a remix from the now ubiquitous "Montana Mask" (https://www.billingsclinic.com/foundation/3d-printed-surgical-mask/) which was inspired by Thingiverse contributor lafactoria3d (https://www.thingiverse.com/lafactoria3d/about). This model has the XYZ coordinates realigned so that the scaling happens appropriately in Cura (previously, scaling z would change the y dimension). That aside, the mask from Billings has what I would call a major flaw. Even though the filter unit fits firmly in the hole in the mask, potentially contaminated air can still circumvent the filter (see image). My modifications put the filter over an external housing. The filter material is secured via double offset zip ties (12"x2.5mm). Additionally, the mask has been scaled +18% in the Z direction and -1% in both X and Y directions from the original MontanaMask design; I don't like having my mouth on the filter frame. DISCLAIMER: I am not listing this mask as a means to help combat the current pandemic. It is merely another potential tool which people can try out at their own risk. Obviously, masks like these need to be properly fitted, equipped with the appropriate filter material, and tested before being "approved" for the task they were intended. Again, USE AT YOUR OWN RISK. Stay healthy folks. <b>Update (4-2-20):</b> I added another variant for folks with smaller faces. This one is still +18% in the z, but -15% to -16% in the x and y. Also, more space has been added for different sized zip ties.