I could not find the right model to fulfil my needs, so I designed one myself. It is composed of two parts: the holder body and the hook. It was printed in PETG with tree supports. A 50% fill of the hook and a 30% fill of the holder work for me. The diameter of the cup holder is 80 mm (approx. 3.14 inches) and it can even hold a SodaStream bottle. The hook can also be used to hold a sun cover or similar.
You can download it from Printables or Thingiverse.
