Cupholder Phonestand [parametric, Skoda Fabia 3]

The readymade .stl is made for a Skoda Fabia 3 (and probably fits other cars for the Volkswagen Group), but you can modify the dimensions in Fusion 360.

Since I think most people use a case on their phone, it's designed with this in mind. However, it works without it as well.

Print in PETG/ASA/ABS (cars get hot in the summer) and if you modify the diameter, choose a tight fit, because natural annealing will let the part shrink slightly). If the fit is too tight, you can sand down the 6 pegs.
No support needed.