Face Shield CNC Headband

This is a CNC-friendly version of this (3DPrintable Face Shield)[https://www.thingiverse.com/thing:4245846]

The model is 3/4" thick but could be reduced significantly. Medical guys say they would prefer to keep thickness greater than 15 mm for comfort during long procedures.

Will update for a full description later.


#Edits#
* 4/6/2020: Uploaded v10, which reduces the wall thickness to 2 mm to reduce weight.

#Objective#

Medical professionals anticipate a shortage of PPE during the COVID-19 pandemic and consider that a suitable Face Shield may be produced by makers as long as:

* The face shield provides a tight seal around the forehead to prevent contamination
* The shield has a considerable (>1.25") separation from the face for ventilation
* The headband be soft and wide for comfort during long procedures
* The shield be as transparent as possible
Beyond that, we need to be able to make it:
* Inexpensive
* Manufacturable at scale by makers (with CNC routers)