I’d rather just buy this on Banggood than making one of these for FPV HD cam by myself.

Lens Cover Set For Xiaomi Yi Action Sport Camera

But… I can not wait another one month, I want to fly my QAV-R ASAP.
We can’t fly quads without these lens cover, I’ve already had experience that I scratched
the lens of my SJ4000 in India trip.

So,,, I had to make one of those lens cover myself.
This is the answer for that!