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A fabricateable face shield for medical workers.
### CBA Quickshield
I'm working on a design that uses three elements:
- a small 2D cut or 3D printed frame, designed for fabricability and material efficiency
- a cut clear plastic face shield
- a padded band (Neoprene or other)
It's adjustable, comfortable, and uses minimal material for manufacture. Machine-agnostic for construction; we Zund and waterjet, but others could mill and cut by hand if needed (or laser).
and the second rev, with a number of minor improvements:
Files for the three components are [here](models/quickshield). Next iteration awaits feedback from Dr 1.
### LL version 3
This version, also designed by [Scale Works](https://www.scaleworkspace.com/), can be 2D cut, and has optional 3D printed 'comfort pieces' that increase contact area in various spots. It still isn't terribly material-efficient and requires the use of a rubber band, but seems to be the design the group is settling around. See [models/LLv3](models/LLv3); I suggest waterjet cutting the frame out of 1/4" HDPE and Zunding the rest out of 0.020" PC for test. Image from Scale Works:
Fabricated and tested:
### Prusa RC1
Prusa, the same folks that make our lovely FDM printers, has released a face shield that has 3D printed parts and a cut clear plastic panel. The files, including a sliced Gcode version, are [here](models/PrusaRC1). This design uses a rubber band for securing and adds a bottom support; it's been iterated a few times and looked over by a number of healthcare professionals, so it's worth trying (although it really depends on big printfarms for scaling). Image from Prusa:
### LL version 20190316.1
This version uses a 3D printed frame that friction-fits to the face. It's a bit painful to put on but otherwise pretty comfortable, and has optional loops for a rubber band to add tension if needed. See [models/LLv20190316](models/LLv20190316) for fabrication files; the frame was designed by the [Scale Works](https://www.scaleworkspace.com/) team while I made the plastic sheet cut file.
After half an hour of wearing, the frame left a somewhat painful red mark on my forehead:
This was mitigated using a bit of self-adhesive neoprene tape:
The mask was passed off to Sarah's doctor friend for testing on an overnight shift (3/18-3/19). Concerns are fabrication time (the 3D print takes ~4 hours) and comfort.
### LL version 2.1
This version can be 3D printed or cut. See [models/LLv2-1](models/LLv2-1) for fabrication files, all designed by [Scale Works](https://www.scaleworkspace.com/). For speed, I chose to waterjet the frame out of 1/4" HDPE, and added a bit of neoprene as before to improve comfort.
The clear sheet cut file for this version came from the Helpful Engineering group; my feeling is that it's a bit short, not offering up enough chin protection. Even with the neoprene pad, I got a decently red forehead mark from this one:
I think the red mark was more due to my lack of rubber band for tensioning; I didn't have any rubber bands so I used a bit of string that was probably too tight. Either way, requiring rubber bands or string isn't great; it's another thing to source/lose/break, and rubber bands in particular don't play nice with hair. A cloth covered hair tie of some kind could work here. Of note: another Slack channel member tested the design for a few hours using 7/16" weatherstripping from the hardware store as a pad and didn't report any discomfort or red mark.
Fabricability-wise, the design cuts nicely using a 2D process but isn't particularly material-efficient.