More comfortable face shield

Wearing the face shield at the mouth.
there is a feeling of openness, and it does not get damp.
There is no tightening on the head.
Since it is attached to the mouth, it is excellent in preventing scattering from the mouth.

The head model used for the installation instructions is a work by lehthanis.
"Full Size Human Head Model for resting headsets on"
URL: https://www.thingiverse.com/thing:758647 Special
thanks to Mr.

File overview
msc_006.FCStd (mouth_shield_C-ver. 6th Trial) FreeCAD format file
msc_006.stl Mesh format file of frame body only
msc_006_pc.stl Model with built-in parts to prevent peeling
pin_c_type.FCStd Pin for connection (C type) FreeCAD format file
pin_c_type.stl Pin for connecting (C-type) mesh format file
pin.zip Pins with different length

A more detailed overview

Emergency declaration has been canceled in Japan.
However, I am still required at work to wear a face shield with a mask.
The "Inexpensive Face Shield" distributed at the workp