This is a parametrized pool nose pinch!

We tested them and they work absolutely fine. Can be a little hard to find the transparent ones in the pool and I don't know how long they will last, but you can always print some more :)

The scad file includes a 4x2 grid with different sizes nose clamps, so you can work out which one works best for you.

Print a couple of clamps and find the right size and spring strength.
You can change the spring strength by changing the diameter of the bridge.

I printed them with PLA, and found that PLA is way to hard to be clamped on your nose. Coating the cushions with hot glue or applying some heat-shrink tubing makes them a lot more comfortable to wear.