thermos opener

owning a thermos bottle I realized quite soon after that the lid is a plain design error

the grip area is way to small for the force you need to open the bottle after you filled it with cooking water and it cooled off a bit creating a vacuume

while I liked the [Thermos Opener v2](https://www.thingiverse.com/thing:1822256) a lot, it was a bit unhandy for me carrying around due to it's length

so I made my own which is more compact