Jessica D Ventura
This mask is designed with a large window that allows full view of the mouth from someone standing in front. A modificaiton of the Montana Mask, weather strips provide a seal around the face. Air flows through vents at the chin behind a barrier, keeping the window from getting fogged up as the wearer speaks.
Complete instructions are posted at https://www.instructables.com/id/3D-Printed-Transparent-Face-Mask/