Psychobob made a 3D-printed upgradeable Sentry Gun, and you can buy your own at his store on Shapeways.
Also, watch him assemble the level 1, 2, and 3 versions in the video below.
After that GLaDOS ceiling lamp this is simply unbearable. I have no money left now. AND NO REMORSE.
Source: moare
Games and Daft Punk wallpapers by SLiD3
Source: slid3.cghub.com
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