This is a phone holder designed with a notch to allow users to use the bottom of the screen.
The notch has an overhang of 45° so there is no worry to use supports as long as its printed on the side.
Also, if using an hexagonal infill, you can leave the bottom and top layers at zero and will work and it will show a cool pattern.
The author remixed this model.
It doesnt have the grooves on the side. This model has a notch at the front so you can use the bottom of the screen normally.