I made a casing to fit a 40mm fan that is placed on the power supply that comes with the Anet A8 printer. Especially in the summer when room temperatures are higher the power supply can get hot. This little fan case reduces the temperature to a safe level.
I designed it in such a way that you can position it anywhere on the outside power supply grid.
I don't recommend placing the fan at the top right corner as this will cause the heat to spread onto the PCB and heat up the components. Instead place the fan in the middle so that the cold air will hit the PCB, flow along the heat sinks and escape through the grid (see picture for guidance).
I'm using a 40mm fan to compliment the size with other parts that I have designed e.g. http://www.thingiverse.com/thing:1803120 and the fan used on the extruder. Therefore only one type of spare fan is needed.
I hooked up the fan to the 12V output on the power supply.
Please view the pictures for more details.
If you made one please also post a picture of your setup.
01.01.2017 - Attention:
It has been pointed out to me that Anet seem to have changed the type of power supply being shipped and it might no longer be the same as the one I have. Please make sure the dimensions (see picture) correspond to your Anet power supply before print!