This model, "Flexible & sturdy phone arm (100% Printed)" is of the user "FunkyArt" (@FunkyArt_274361 on printables.com).

https://www.printables.com/model/647794-flexible-sturdy-phone-arm-100-printed/files

The custom 3D-printed phone arm is designed to securely hold a phone during video recording. Made with sturdy beams, it features an adjustable structure to fit various phone sizes. The arm can be mounted to a stable surface, ensuring that the phone stays in place throughout the filming process. With its flexible design, it allows for easy adjustments to angle and height, providing the perfect shot for different types of content. The phone arm is lightweight yet durable, making it easy to transport and set up for each recording session. This practical accessory is built to improve the efficiency and professionalism of video production, reducing the need for a second person to hold the camera.

I used PCBWay's 3D printing service since the model had a large build plate requirement.

Here is the Youtube video featuring the beams: https://youtube.com/shorts/uEHYvtUVapk?feature=share