This is a replacement tab for the button on ion8 water bottles.

The original part was a slide mechanism made of two parts but I made a lever mechanism (which I'm told are how they used to work) instead.

You'll need to use the original spring. To replace the part, just unhook one side of the clip (as shown in the image) that is deliberately loose.

I recommend PETG if you put your bottles in the dishwasher. I also recommend using a 0.2mm nozzle and as many walls required to make it 100% solid.