iPhone 4 case and support for bike and mtb

This its iPhone 4 case (derivate from http://www.thingiverse.com/thing:31027) and support for bike and mtb i have made and tested with my mtb in hard downhills.
It's easy to print and if you want can personalize the model with SketchUp.
When you don't have the iphone over the bicycle it is a small support without dangers.
I prefer to print with:
infill 10%
Number of shell 3
Layer height 0,20 mm
When you end remember improve the joint with a filing