Modified Montana Mask

This is a modification of the Montana Mask as found at the site below, this is a personal modification with a little more nose room and adjustments to the filter system.

Original fusion360 files obtained from:
https://www.billingsclinic.com/foundation/3d-printed-surgical-mask/
https://www.makethemasks.com/

I primarily modified this as a dust and particulate filter mask, the filter is assembled so that a single large filter could be used with spacers or multi layer thin filters.

The fusion file uses a custom thread file that is also attached (it is a modification of the E27 Light Bulb Thread)

4/4/2020: Added some pictures of a filter example, using a first layer of microfiber pillow case, a center layer of blue shop towel, and a rear layer of microfiber pillow case. Does add a lot of resistance so I would say something using 3 layers would be a short time use situation. for dust masks and similar a single layer is all I would use.
4/4/2020: Added a snap on shield/dive