Just like haasebert's original, but redesigned in Fusion 360, mostly as a way of learning Fusion 360.
The design in mostly-parametric, so you can change the height, width, and depth of the design for differently sized mobile devices.
When printed with ABS, this case works with iPhone 5 though iPhone 7 plus, both with and without cases. Depending on your PLA, this design may not flex right to act as springy clamps on the phone.
In addition to the STL files, STEP and F3D files are available.
I wrote up a small blog post about this thing here: