This is a covid19 face shield that is easy to make and use with "Z87 replacement shields" (these have clear lenses and slots in them)

** can buy the Z87 visors here ***
https://www.grainger.com/category/safety/face-protection/faceshield-replacement-visors?attrs=Visor+Material%7CPETG&filters=attrs

This mask works great with Z87 replacement shields. You can also use the common "report" binders and 3 hole punch them but they are usually not very clear. It is best to buy a Z87 replacement shield for a few bucks since they are crystal clear and impact rated.

We also changed the design so you can make it with a .25" router bit. We shortened up the loops in the back and made the hooks larger so that a .25" bit could cut them.

3D printing is great but if needed in mass quantity then it is best to buy 3/16 plastic and use a large bed router with a .25" or smaller bit.