Flex Filter (Coffee Filter) Mask (Rev 2)

(4/8/2020: Updated to improve printability and provide additional outer frame sizes. Slightly thicker walls and revised side ports to increase stability while printing)

This mask basically uses an open/twin frame design to trap the filtration media between the frames. In this way, many different types of filtration can be used if available (Fabric, Melt-Blown Polypropylene, or even standard 10 inch Coffee Filters). Additionally, excess filtration media can be trimmed and folded into the mask to act/aid as additional gasket material. It is very easily printed and requires no post-processing or trimming.

*** NOTE: that this mask is NOT intended to serve as an N95 replacement and has not been designed/tested to meet ANY specific filtration criteria. ***

Basic Design Criteria:

1. Readily available filtration material: Many of the existing designs require specially shaped or formed filtration material. Some filters are square, some are round. In order for the masks to fu