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Not my design.. Looks like they use a silcone or soft plastic beading for the edge of mask.
This is a face mask designed by a dental surgeon in the USA. https://longliveyoursmile.com/3d-printable-mask-for-covid-19/
http://www.plhae.com/montana-mask.php Have modified it. Image is from their webpage
Hey Philip, I increased the size of the mask's filter. https://www.myminifactory.com/object/3d-print-large-filter-for-the-montana-covid-mask-137350