For more designs visit:
https://cults3d.com/en/users/UniqueDude/3d-models
https://www.thingiverse.com/shitshappen/designs
Note:
After printing you need to cut away accessible supports for hinge and carefully break open to release movement of hinges.
Update 05.06.2024.
Added updated version of phone holder, see link
https://cults3d.com/en/3d-model/gadget/small-phone-holder-streamline
The author marked this model as their own original creation.