Table of Contents

The Result

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Media ID: B-CubGHoe8e

The Intro

Note: Allthough the filenames contain the strings med or medi, the resulting things have no medical purpose. It’s an abbreviation for medium, for a medium quality solution without any purpose.

This thing is one of the many results of the #WirVsVirus Hackathon, where I had the chance to work with the Team behind medpring.org. The goal of this team is to connect makers and institutions to design and produce 3D printed parts, that are either produced on spare capacities and shipped, or directetly printed/laser cut in their own fablabs.

You can see some images of the results of the hackathon weekend here: medpring.org/images/.

This post collects the information around the face shield, which I worked on.

Ofcourse, this is not the only approach to build a 3D printed face shield. The following projects aim to do the same, and are worth a visit. We used these as inspiration. :)

Prusa Protective Face Shield

See: https://www.prusaprinters.org/prints/25857-prusa-protective-face-shield-rc2

This approach looks very sturdy and sophisticated. But the size of the headband itself and the requirement of additional parts (size + head strap), makes a DIY approach more work, to get the 3D printing time, material and laser cutters to cut the shield to match the frame. The shield is mounted from the front to the headband.

Thingiverse: Eye/Face Shield Frame

See: https://www.thingiverse.com/thing:4153221

This looks almost ideal from a material vs print time perspective. They provide stencils to create the shields from transparent film sheets, that need to match frame. To attach the shield you need to slide the sheets along the frame to the front to put it in place. This way the front part of the frame is infront of the shield.

Protective Visor

See: https://3dverkstan.se/protective-visor/

Similar to our approach, with additional splash guard above the eyes, and more hooks to connect the shield.

Brim Shield

See: https://www.thingiverse.com/thing:42330520

Clips to attach a shield to a baseball cap.

faceshield.nu

Personally, I switched to printing the face shield from : https://faceshield.nu.

https://github.com/Cederb/Faceshield.nu/blob/master/Europe%20ISO838/3D%20Printing%20Files%20(STL)/Thicker%20brow/Visor_frame_EUROPE_ISO838_v4-1mm_front.stl

The Design

We used the Eye/Face Shield Frame as a starting point. The feedback from the medical community was, that the amount of frame that is infront of the shield should be minimized. This is the case with the Prusa Protectice Face Shield (but requires a matching shield). So the Prusa approach is feasible, but we still had to simplify the production of face shields, so we would need a laser cuttor or plotter (especially on a Hackathon weekend ;) ). The idea was to use a off the shelf hole puncher (which every office has), to perforate a transparent film sheet (DIN A4 or us letter), and modify the design, to hold the shield with these two holes. The sides are then slottet to the side of the frame.

The Parts

The Frame

V5

V5 is the latest version, which comes with updated face shields.

You can also try the foldable version, but I don’t recommend it as it is not as stable as the one above.

The following video shows how to assemble this version:

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Media ID: B-LBxxlq25k

The Shields

Click on the image on the left to see the dimensions in mm

V5

Manual Cutting

To create a shield all you will need is a hole puncher and a transparent film. Cut the film into your required shape.

You can see the intro video of this page as a short howto. (It still shows the old version V3, which only requires 2 holes. V5 shields have 4 holes)

Laser Cutting

If you have access to a laser cutter or plotter, or want to cut them manually, you can use the following things as stencils. You can find prepared .svg files here: https://backend.medprint.org/library/medishield Or here:

See: https://p3dt.net/things/util/medi-frames/medi-shield-v5-rect-small-straight.svg

and: https://p3dt.net/things/util/medi-frames/medi-shield-v5-rect-large-straight.svg

Both have a width of 210mm.

Note: Laser cutting might burn the sheets (too much?) and give them a burnt smell while wearing, so using a plotter to cut the shields is recommended.

Below are the exported .stl files from the blender source (because I don’t know how to use Inkscape), to give you an idea about shape/size: