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March 30, 2020 at 16:32 #99000Manfred EhresmannParticipant
WARNING: The use of the supplied models is not an equivalent protection to a FFP protection mask.
WARNING: This ISM (improvised surgical mask) is neither tested nor certified by any offical health organisation. This ISM is an improvised fallback in case of a pandemic where surgical masks are no longer available.
A single mask set is printable in little over 1 hour.
A simple ISM (improvised surgical mask) has been designed, for very fast and cheap production with common FDM 3d printers. A shell + insert principle is applied, which are used to secure a to be selected filter media. The filter material is single use. The pieces can be cleaned with soap water and are reusable. The insert is able to fix a cotton pad as potential filter material.
Options for customization
Scale in slicer to your needs
Parts are optimized for printing via vase mode of a common FDM 3D printer. This produces a single walled pieces, with wall thickness of 0.4 mm, which can be air tight.1
As these are single filament sheets cleaning is easy and effective. Soap water with subsequent rinsing is suitable for cleaning after use. Common 3D printing materials are not negatively affected by the use of soap water or other disinfectants.
Additionally, vase mode allows for very fast and material efficient prints of large volume pieces.
The improvised surgical mask consists of a large outer shell and a small insert ring to fix the filter material.
Filter material as well as selected a suitable strap are up to the user. The size of the filter material should be at least a square of 50 x 50 mm². Allowing for much reduced filter material consumption.
High quality filter materials are to be preferred: HEPA, anti microbial etc. Inform yourself of potential alternatives.
HINT: For filter material selection, check here: https://smartairfilters.com/en/blog/best-materials-make-diy-face-mask-virus/
Layer height: 0.2 – larger layer height may lead to holes
Printing Mode: Vase-mode / spiralize outer contour
A full data set of other models of this kind is available here: https://www.thingiverse.com/thing:4245271
ON THE EFFECTIVITY OF SURGICAL MASKS
The improvised surgical mask is intended to reduce the dispersal of aerosol of the wearer (reverse isolation). This it is not a self-protection device, its effectivity is dependent on the quality of the used filter material. The use of additional filter layers may enhance the effectivity.
For example the distribution of the corona-virus happens through aerosols. Aerosols are produced during talking, coughing and sneezing. These aerosols can come in contact with mucus membranes of contact persons. The aerosol droplets can further contact and subsequently contaminate surfaces. Direct contact with these surfaces that contain virally contaminated secretions and subsequent hand-mouth-nose contact may also lead to contraction.
The wearing of a improvised surgical mask may reduce contagion paths of the corona infection. Thus, it is sensible to wear a surgical mask for any contact with persons of the risk group to reduce the spread of aerosol droplets to the contact person.
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