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This mask utilizes end user supplied 38mm / 1.5'' filter material. 1 n95 mask can be cut up to make 5 filters, or any material can be used.
Also utilizes a 1 way filter so that exhaled breath does not exit through filter, greatly increasing filter life.
Also has strap guides which use 10mm / 3/8'' strap.
Here is a link to the valves,
Materials and methods
Printed with PLA on an Ultimaker 2
.2mm layer height
wall thickness .8mm
top bottom thickness .8mm
print speed 60mm/s
support grid, density 20%
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