This is the Aperture Science logo, featured in the Portal games made by Valve.

Modeled by me, optimized for printing.

Portal and it's logo is respective property of Valve inc.

This logo is about 8cm in diameter, but could probably go as far as 4 cm or less.
It should also be detailed enough to be printed to the size of the entire surface of any 3d printer.

Please allow to cool before removing from the heatbed, this is held together by very thin threads, meant as a stick-on for a window, computer case or in my case the Mendel90 reprap.