Protective Boot to prevent dings to the bottle but mostly to other surfaces, has a thick bottom and as a bonus it fits on smaller bottles that my toddler uses.

Fits 40oz, 32oz, and the 24..?oz bottles from various brands we have at home, Owala, Yeti, Stanley, Thermos, etc.

Tight fit, but that's so it doesn't slip off so it must be printed in flexible material, hopefully you will not need to scale depending on your bottles.

I printed with gyroid infill so the bottom has some squish.