You are free to sell or use this for yourself.

This is an ergonomic design based on a common 4 or 2 hole punch coronavirus face shield. It works with 10 mm wide elastic bands so that you only have to do a knot in the ends. I modified it to be more comfortable than the original. It gets done in between 30 to 45 minutes depending on your settings. 

With this you have the freedom to use thing trasnparent films from the  office supply store or thick or even recycled PET sheets. 

I also include a shield that can be laser cut to fit these in up to 1.5 mm transparent plastic sheets.