Reusable Mask Frame_MTB

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 pa