I had a big water bottle and a car with a less big cup holder so I made this so I could adapt my cup holder to my water bottle. It was designed for a bottle from Costco and a 2015 Dodge Dart but will probably fit many other bottles in many other cars. It's nothing that special but I hope someone else might also find it useful.
I printed mine in PLA with 3 perimeters and 15% gyroid infill but ABS or PETG is probably better UV-wise.
The author marked this model as their own original creation.