This is a tablet stand originally designed to hold an iPad air 5th gen with a slim case in the vertical or horizontal orientation. It also fits an old iPad 3rd gen and probably many other tablets. The stand is wide enough to avoid any wobble when the upper corners of the tablet are pressed.
The best orientation for printing is sideways; 2 perimeters and 15% infill is more than enough.
The author marked this model as their own original creation.