Lenovo s850 Case

Needed a basic case for my daughter's Lenovo s850 phone but could not find anything suitable on-line so I whipped this up in SolidWorks until someone more talented in 3D CAD comes up with a more elegant solution.
NOTE: We've found this case fits a bit tight. May be best to scale it up by a ratio of 1.009 on all axes at time of printing.