Hi,

I had a problem, where should I put my cell phone? But then I printed something for the bar of my screen holder and made it public for you. It also works for tablets.
You only need a screw (m5, approx. 1.5-3cm long) and a piece must be printed with tpu, but the part is already in the file, it is a ring, alternatively you can also use something thin non-slip, e.g. tape or rubber.

Have fun!