I made this model to fix the straw cover on my sibling's hydro flask, it broke off, and would cost ~10 USD to buy a whole replacement lid just for the straw cover. This model works but it could be improved so I've uploaded it to the public domain so that anyone who wants to improve it can improve it.

Print Settings:

Orient it for your printer, I have found the best success at weird angles since it adds extra strength to the walls and especially the holes that attach to the water bottle.

Supports: Yes!!!

Wall height: 0.2mm

Bed adhesion if you need it, but it worked fine for me without any bed adhesion.

I used PLA, but I can see this working better with a more rigid and sturdy plastic since PLA can be very flimsy if bent.