My girlfriend has a 2000 Honda Civic and she often needs her cellphone for navigation. I wanted a cheap and robust way to achieve this.

I wanted absolutely no sloppiness, so the part that interfaces with the car is very tight but slides in easily.

The part that holds the phone is tight on the rails. I added two 0.2mm detents on one end of the bloc that goes in the car, it removes all the tolerances

The part that holds the phone is made to be switchable when you change phone. The part as it is has been designed for a Samsung Galaxy S21 FE