The Czech 3D Printer company Prusa has been on it for a while: https://www.prusa3d.com/covid19/ and they have been open-sourcing the design. You can print it on a 3D printer.
Based on that design (and others) makers in Germany have started organizing, so that people can either request shields or supply shields. Organized on Slack and into local distribution hubs. We hace started sharing supplies and even got discounts from filament vendors: https://www.makervsvirus.org/en/
Edit: Just wanted to share something related and not downplay Apple with this comment. Would love if they'd opensource their designs ;)
Based on that design (and others) makers in Germany have started organizing, so that people can either request shields or supply shields. Organized on Slack and into local distribution hubs. We hace started sharing supplies and even got discounts from filament vendors: https://www.makervsvirus.org/en/
Edit: Just wanted to share something related and not downplay Apple with this comment. Would love if they'd opensource their designs ;)