I designed this cup holder phone holder specifically for Subaru but probably fits most cars.
Rectangular separator in the middle hold phones or objects up to 17.9mm thick and 99mm wide. Should fit most phones with cases and even iPhone with Magsafe wallet. Side areas are ideal for a pack of gum and some pens and junk as shown in my pic.
PETG or ABS are the recommended materials for long-term usage in a car. I used 04mm nozzle to get 2 walls of material. It's super minimal to make it space optimal.
The author marked this model as their own original creation.