3M adaptor for secura filters
thingiverse
Easy to print, Allows use of secura in 3M masks It prints i two parts and come tightly together, can be glued in place. Secura side require 2mm thick seal, it can be" -printed with rubber ("cutter" file) -cut with laser out of silicone/rubber of sheet (SVG file) -cut with a knife out of silicone/rubber of sheet (print "cutter" file and use it as guide/stencil) Quality of edges in not critical, sealing grooves are in the middle between inner and outer edge of that seal. Those filters are easily online, toss an adaptor to Your doctor :)
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