This is the final Companion Cube!
I used fiberglass to reinforce the paper model (that was quite a messy work!) Then finished it with primer, sanding and finally the paint.
The size is about 20cm. I will use it for a Portal Cosplay along with a combustible lemon launcher!
Maybe I'll make a portal gun later when I have enough free time.
As you hopefully notice this is a 3D stereographic picture. If you have for example Nvidia 3D goggles you can rename this file to a .jps and take a look.
There is also a free stereo photo maker that can be used to view it with any kind of color (anaglyph) or shutter glasses.