I wanted a low profile side mounted holder for my phone that is running OctoPrint for Android.
I used the basic design from the Prusa Mini Side Spool Holder, mirroring and extending it to put the phone slightly further away to get a better angle for the camera.
The actual phone holder slots into the vertical extension via a 5mm diameter hole, its a fairly tight fit which ensures that the holder doesnt rotate on its own, but allows you to adjust the angle.
The author remixed this model.