MTU 3-D printing PPE

From Appropedia

In an effort to meet the demand created by COVID-19 outbreak for face shields, masks and open source ventilators, the J. Robert Van Pelt and John and Ruanne Opie Library and the Michigan Tech Open Sustainability Technology Lab have started 3D printing face shields, reusable masks, and ventilator tube splitters based on open source materials. Support this work on Superior Ideas.

Face shields[edit | edit source]

MTU face sheilds

Halo - 3D printed headband (ABS, PLA, or PETG)
File:HaloIX 5mm.stl

  • Our most recent efforts have been directed to support the return to face-to-face instruction. With the help of the feedback from the faculty instruction and support staff, we have come up with the HaloIX and enlarged Halo-IX-EXT.
File:HaloIX-Fusion-Head.png
HaloIX-Fusion design to fit with comfort


File:HaloIX 5mm.stl

Design comparison


File:Halo-IX-EXT.stl
HaloIX-EXT - Magnum - resized for a larger head


A frame with ability to hold a transparent semi-rigid sheet is printed using Lulzbot Taz6 printers with PLA and PETG fused filaments and then the transparent sheet is punched and glued to the frame making it a complete face shield covering the entire face of the person from forehead to under chin and is also curved to cover the sides.

Shieldbare.jpg

A complete assembly of the face shield.

Shield.jpg

We recently modified the design to increase the distance between the user's face and the shield to better allow for safety glasses and N95 or surgical mask. We leaned towards this design due to the one size fit, comfort, and simplicity of print. We are able to nest 2 on a bed and it takes ~ 1 hour with the 1.2mm or closer to 2 hours with the .5mm nozzle. Each halo is roughly 22 grams. Here are the latest versions of the design.

File:Mod-Sweden-DOH3-NB.stl

File:2x-Mod-Sweden-DOH3-NB.stl

Swedish-mod_David Holden
Comparing Swedish-mod & PRUSA
design overview

Below is a hole punch or drill out template that can be used for either of the current Swedish designs.

hole punch template for shield


Below is a Lulzbot Taz6 printing the swedish design face shields with multiple shields stacked up with a grid type support layer between each face shield. This approach could potentially reduce the need of being around the printer while we print multiple numbers of shield a day. An stl file of this could be found here File:10 stack swedish modified.stl. While printing this stl file be sure to generate support everywhere using your slicer application and then generate your gcode to start printing.

Stacked printing.jpg

The transparent semi-rigid plastic sheet 0.3mm thick has dimensions of 8.5in x 11in which is good enough to completely shield most face sizes. This sheet is punched with holes and then mounted and glued to the frame which completes the assembly of our shield. UofM went pre-approved [1]

Masks[edit | edit source]

  • Mask designs based on COVID-19 MASK (Easy-to-print, no support, filter required)-Cults 3D, or from Thingiverse
    • Filter is square material inserted in cavity, held by front panel.
    • Very hard to ensure that air goes through the filter, not around it. Need filter material larger than open square.
    • Front panel and internal grill fit is sketchy. It's easy for them to be a bad fit. Can be made easier by printing grill 1% less scale than rest of mask.
    • The COVID-19 MASK (Easy-to-print, no support, filter required) from Cults3d printed it on a standard TAZ6 with standard settings and a Creality Ender 3 in PLA 1mm outer 10% infill and made a gasket for the rim from a close-celled foam from the old enable-hand designs. It works well just with friction fit so I don't think it even needs to be glued in. This will make the entire thing easier to disassemble and clean. The mask fits adult males well...maybe cut it down 10-15% for women and younger people.
Covidmaskssize.JPG
  • Face mask reviews - covers other designs and filter materials
  • Mason Stone scaled the filter grid from the "Billings Clinic" and posted it Billings" Filter for COVID-19 MASK
  • This now fits the "COVID-19 MASK" design and I think this is a preferable method for using a self-sourced filter as it provides a good solid fit for the filter.

Ventilator Splitters[edit | edit source]

As there are not enough ventilators in some regions it is possible to split a ventilator between two or four patients although you loose some functionality it does care for more people.

4wayvent.jpg

4cm Bias Tape Maker[edit | edit source]

Strap-maker.JPG
  • To help local manufacturing of cloth-based masks to prevent community spread and offset use of medical-grade masks for medical professionals: 4cm Bias Tape Maker - mask designs at CraftPassion (better fit - you select the size that fits you) or Free Sewing

Nasal Swabs[edit | edit source]

Osswab.jpg

Future Targets[edit | edit source]

COVID and Unis[edit | edit source]

Disclaimer[edit | edit source]

These materials are provided “as-is” and have been made by students and academic research personnel based on publicly available designs which have not been tested nor submitted for any regulatory approval or certification. Michigan Tech disclaims any and all warranties including those of merchantability and fitness for a particular purpose. Recipient hereby indemnifies and holds harmless Michigan Tech: against all claims, costs or judgments (including expenses of defense) arising out of recipients use or distribution of materials or products provided to recipient by Michigan Tech; and from and against any and all claims, costs or judgments (including expenses of defense).


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