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This bracket holds a 12mm thick (or less) fan by the corner with the fan wires fed down through the middle of it. Its base fits in the hole in the platform for the two doors on a Rostock Max printer and lets you rotate it to point it at different parts of your print. Since there are two free holes in the platform, you can add two of these to the platform to cool objects from different sides. It protrudes a little bit through the platform to block the door so you can't close the door and pinch the fan wires.

I originally wanted the fan to be held in the bracket just by friction but that didn't turn out so well so I added a hole that lets you stick a screw through the corner to attach the fan to the bracket.

http://www.thingiverse.com/thing:74728