Embarrassingly simple cover that sits over the IR and webcam on a surface book 2 - also my first go at using TinkerCAD to make something useful.
Thin enough to stay put when closed.
My laptop has a habit of waking up and opening when it sees me, whether I wanted to unlock or not. Not fun if it's left on my desk at work.
I was using a piece of paper to cover the 2x cameras, but came up with this more elegant solution...

Print instructions

Print. Enjoy.