I designed this to replace my "one size fits all" phone holder (they never seem to work properly). This thing can be customized to fit a particular car vent louver, and a particular smartphone. Getting a new phone? Print a phone cradle to match. New car? Print a new louver and bumper. Mix and match as needed.

The only hardware required is a 12mm M3 (1/2" 4-40) bolt and matching nut.

It should work for most cars and phones. I've only tried it out with a 2018 Versa and a Pixel 5A with a Spigen case.

There are over 30 parameters to play with. Should be more than enough to keep you busy.