This is a case for google cardboard because the cardboard case is really bad and this is much better

Print Settings

Printer Brand:

Ultimaker

Printer: 

Ultimaker 2

Rafts:

Doesn't Matter

Supports: 

Doesn't Matter

Resolution:

0.3 - 0.4

Infill: 

None, vase mode

Filament: Ultimaker PLA Any Color

Notes:

Print at 215 degrees to really bond the layers together and set bed for 70 degrees for good adhesion.