A smartphone and tablet stand, suitable for most devices and easy to print.
I updated my design on 2017-07-03 with better support on the back to even hold vertical tablets quite well. I also provide two separate stl files now, in case you want to print the left and right sides separately.
You may have to trim the bottom touching the ground a bit to make it perfectly even.
Avoid warping if you can (as always i guess).