Tyvek soft facemask with common materials and reusable parts.
Description
This respirator facemask can be built of common materials plus small, easy-to-print 3D printed parts, and a small (55mm) disk of filter material. The mask is adjustable to the face, with the Tyvek forming an impermeable membrane, concentrating the breathing airflow through the filter housing. The filter housing is made of 2 identical 3D-printed parts that snap together over the filter and around the edge of a circular hole in the Tyvek. The filter material is a 55mm diameter disk of material (preferably HEPA-certified) that permits sufficient airflow. The resulting mask, when properly fitted, is protective and breathable, The 3D-printed parts are a small, quick print, using modest amounts of filament. The idea is to make lots of these parts quickly, several can be printed at the same time. This mask is intended for emergency use during this pandemic when manufactured products are unavailable. This device is a general purpose face mask intended for use in the community and is not suitable for use by a healthcare professional or in a healthcare facility or environment, as described in FDA Guidance Enforcement Policy for Face Masks and Respirators During the Coronavirus Disease (COVID-19) Public Health Emergency, Section V B. This device has not been tested to assess the out-gassing limits of the material or their corresponding health effects. The following files are supplied: maskresp40.stl --3D-print Filter Housing half, 2 of these snap together. maskresp40loose.stl --Variant of maskresp40.stl with looser tolerances MaskPatterns.PDF --Terse instruction sheet and 4 different-sized mask patterns MaskInstructions07.PDF --Extensive illustrated instructions and discussion. This file is versioned. NoseThingy2.stl --3D-print nose-shaper part, holds wire NoseThingy.stl --Older, shorter version of NoseThingy2.stl Earband4.stl --3D-print ear loop (optional, new) Earband5.stl --3D-print ear loop (optional, new) Disk_stencil.stl --3D-print stencil for cutting filter disks (optional) SanpAlignTool.stl --3D-print tool to help snap filter housing (optional, new) Plain paper can be substituted for Tyvek, but it is not as durable. Tyvek is available as office supplies, construction material, and protective clothing. Do not print Tyvek with a laser printer. Tyvek is a trademark of DuPont. I would appreciate real-world feedback on the use of these masks, especially by clinicians, so please comment. Note that this design is also available at: https://3dprint.nih.gov/discover/3dpx-013519 Addition discussion may be found at: https://biostart.io/diy-forum/topic/paper-type-diy-medical-face-mask-with-reusable-3d-printed-filter-housing-insert/ Old title "Paper-type DIY medical face mask with reusable 3D printed filter housing insert." changed on 27 April 2020.
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