Slotted Face Shield

This is a remix of https://www.thingiverse.com/thing:4253904
I really like that design and it's great for hospitals and ICUs because of the closed top.

However, for something like a school setting, the completely closed top isn't strictly required. I wanted a little slot to allow hot air to vent out hopefully making this a bit more comfortable for teachers and kids. Using a small slot instead of completely open helps retain a lot of the strength of the original.