I've been exploring generative design philosophy using Fusion 360 and this is an early result. By tweaking user parameters, you can change the tilt angle, wall thickness, and many other settings. This was designed around my Ipad 4, but by adjusting the footprint settings in user parameters, other tablets can be accommodated.
Features include:

• optional front camera cover flip tab
• porthole for headphones
• automatically generated template which prints in minutes for testing your particular device profile and tolerance
• tablet itself is also generated as a reference mesh.
• standard 1/4"-20 mount hole in base
  Please post your makes and remixes so other devices can be supported.
  For people editing in Fusion 3D, a value being multiplied by a decimal is always a proportional tweak (for example, .5 = 50%) giving you fairly dynamic customization.

Robo 3D

R1 ABS + PLA Model

No

Yes

.25

30

Supports should only be needed for the center backer bracket.