Prusa RC3 Face Shield: A prototype face shield that was developed by Prusa Printers. They went through dozens of prototypes and two verifications with the Czech Ministry of Health. https://www.prusaprinters.org/prints/25857-prusa-face-shield
3D MASK: Please note the legal disclaimer. The Montana Mask is not an FDA or NIOSH approved N95 replacement. Please see updated FDA Guidance HERE.
https://www.makethemasks.com/3d-printing
The Prusa RC3 Shield's and Montana Mask's information presented here is intended to assist the general public during the current global pandemic related to COVID-19 and the related nationwide shortage of personal protective equipment. Please be aware that this mask design is not intended to replace standard protective equipment such as N-95 masks or surgical masks when that equipment is available. Each facility should test each batch of masks and face shields prior to relying on them for protection. Stay safe!