Simple A4 folder face shield
Eisuke Tachikawa has a simple template that creates a face shield from a clear A4 folder in under a minute.
Reusable face shield design
TechnoChic has a video showing her build of a reusable face shield.
NIH-approved face shield
No holes prusa-based shield
Adam Brown provided plans for his 3D-printed, Prusa-based face shield. Biggest difference is that it takes a standard A4 transparent sheet without having to make holes.
Link: A4 transparent sheet face shield
Laser-CUT PRUSA face shield
DIY Face Shield in <1min, ~$1
Isaac Naor has a very fast and simple way to make s face shield using transparency film, foam window insulation and a rubber band.