AeriosPixel - DJI Phantom 2 RC iPad mini Clip Clinger

I have made 2 designs for iPad mini that attaches with the Apple Smart Cover or Case and another one without cover or case.

I printed on Da Vinci 1.0A with the following setting :
Layer height : 0.2
3D Density : 0.15
Shells : Standard

Any suggestion please let me know.