Small can adapter for slim cans like energy drinks, based on Citroen and Peugeot can holders. I guess the normal 33cl cupholders in Europe are around the same size.
This one's outer diameter is 72mm on top and 64mm on bottom. (Cup Holder 2.stl)
It's design is based on https://www.thingiverse.com/thing:1250571, but it's a complete remake.
- As a request I added another design with an inner diameter of 58mm, more specific for use with 33cl small can like Aldi or Gini.(Cup Holder 58mm.stl)
I used a honeycomb infill.
There is no pressure, so 10% infill is more than enough.
The holes are not only decorative, but it also saves plastic and you can put your fingers inside to lift it out.