This is 3d model of a portrait smartphone holder holder designed to be used with any 4 holes AMPS mount. You can use it with a ram mount interface. He got tight tolerances but it's easy to slide the phone in it.
Print it in ABS / ASA / PETG for more heat resistance.
Optionnaly, you can print some spacer in TPU to dampen vibration.
The author remixed this model.