PRUSA Covid-19 / Coronavirus Face Shield With Integrated Folding Strap by doublec4

In this video I show you my revisions to the popular Prusa 3D printed Covid-19 / Coronavirus face shield. I noticed some areas that I thought could be improved with the original design. The biggest one was the requirement for some kind of elastic strap in the back. I don’t believe it is something that people have around the house and it is an additional component that is required in the assembly of the face shield.

I designed the strap to be a “print in place,” captive feature that is ready to go off the print bed with no assembly and no hardware required. You simply remove the limited amount of support required and just work the strap back and forth a few times to get the detent feature free and you will notice the straps snap into many different positions.

When wearing the straps at the back of the head, you can angle them to pull the mask closer to your face. I found that the original design kept the mask at too steep of an angle, exposing a large area under the face shield.

The straps should accommodate a large variety of head sizes, and the smaller holes work well if you choose to use the strap on top of your head. If you wear the straps on top of the head, you can still attach an elastic in the vertical slots, or get creative and use Velcro strips or even simple zip ties.

This face shield requires a front foam piece, otherwise it can be uncomfortable to wear for long periods of time. I am using off cuts of acoustic panel foam because it is what I had in the house here. You can weave the foam through the hexagonal openings on the forehead piece. You can also use paper towels, or cut up t-shirts, etc. These items should be single use as they are porous and very difficult to properly sanitize.

Print directions:

Material: PLA+

Layer height: 0.3mm

Support: Only on build plate, do not support bridges. These options are important to make the detent feature work correctly!

Assembly:

Just remove the supports and attach the PETG face sheet.

The sheet should be 0.5mm thick and the size of an A4 piece of printed paper (8.5″x11″). The drilling and cutting template can be found on my Thingiverse link, as well as on the official Prusa site for their version of this mask. They should both work the same as this is based off of their RC2 model. The lower chin piece is unchanged from the Prusa design and I saw no issue with this.

If you plan on producing these face shields for others, PLEASE practice good cleanliness and look up guidelines online for what is required. DO NOT CONTAMINATE THE SHIELDS and then hand them out to front line workers!

If you guys have any suggestions for further improvement please let me know!