Customized version of http://www.thingiverse.com/thing:40703
Created with Customizer! http://www.thingiverse.com/apps/customizer/run?thing_id=40703

Using the following options:
pattern_thickness = 3
pattern_radius = 8
case_thickness = 2.4
pattern_shape = 30
pattern_overlap = 21
pattern_rotation = 0
build_plate_selector = 0
iphone_version = 2