Koi Faceshields
This is an open source design I worked on during the COVID-19 pandemic. The goal was to achieve a quick and material-efficient solution that could be made at a low price with only a 3D printer and basic tools. The fastest single unit time was 9 minutes, and it's possible to get 20 pieces in 3-4 hours when stacked in KOI towers.
Public resources can be found in it's Thingiverse page.