The Bowshock: Alpha Flight Helmet NVG-Mounted 3D Printed Face Shield

A Careflight nurse found our local 3d printed PPE group (http://www.MakeItDayton.org) and expressed a need for a face shield that would fit on his flight helmet. After we helped get one working for his helmet (see that one here: https://www.thingiverse.com/thing:4307004), we found out about another popular helmet style, the Alpha (with an NVG mount).

That was the beginning of Project Bowshock. After a few iterations on the design, we've settled on this version. It needs to print laying down flat to maintain strength, but assembles quickly with three #8 x 1" screws and is very strong. The NVG-mount holds it in place after being snapped in with the top NVG-mount clips flipped up (see photos). Assembly video shown here (assembles in a couple of minutes): https://youtu.be/CBfgJ7aNRHE

For the face sheet it uses the same spacing as the files from this link and we use the US_6_Hole_Template_by_Joel_Telling version:
https://3dverkstan.se/protective-visor/
Shown in the photo is an 8.5"x11" sheet, but an 8.5"x14" (legal size) would cover around the sides better.

Disclaimer of use

This 3D model has not been approved by any regulatory agency and has not passed any laboratory tests. It is a prototype designed by our group, with the aim of providing emergency protective equipment to medical professionals who need it, given the current global shortage of supplies. Use it at your own risk.