This is a model of a face protection mask with an exhalation filter.It is advised to print the main part (that is attached to a face) from rubber 3D materials.
You can use paper tissue as a filter.To learn how to prepare the exhalation valve for use, watch https://www.youtube.com/watch?v=-Pf-NryzXIc&t=2s
THIS IS NOT TESTED FOR ANY PROTECTION LEVELS!A