This is a bracket designed to fit the laptop stand for this particular dual monitor stand (https://www.amazon.com/dp/B08SW9DKPK?ref=ppx_yo2ov_dt_b_product_details&th=1). Design allows the phone to be held at an angle for ease of use, while also being modular so you can set your phone portrait or landscape and it will fit. Recommend printing 2 unless you enjoy daring feats of balancing smartphones on narrow ledges.
The author marked this model as their own original creation.