Google Cardboard - Single Piece
thingiverse
I used Google's .eps drawings in 123d to design a version of Google Cardboard that requires no assembly. Just print and drop your lenses in (45mm focal length, 25mm diameter). It's sized specifically for the Galaxy S4, but it may fit other phones. I'll upload the 123dx files later so you can customize it. Also, I intend to update the design with a snap-on top piece. I'm also going to make slots for the magnet toggle, once I get the magnets. :) Instructions https://developers.google.com/cardboard/
With this file you will be able to print Google Cardboard - Single Piece with your 3D printer. Click on the button and save the file on your computer to work, edit or customize your design. You can also find more 3D designs for printers on Google Cardboard - Single Piece.