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Ultimaker Replacement Electronics Fan
This is a replacement for the noisy, low quality electronics fan that comes with the Ultimaker Original.
The supplied fan has some well documented problems with its bearings - they get noisy and need regreasing from time to time. Mine started making a lot of noise and didn't seem to be completely repairable, so I designed this.
This design uses two 40mm fans (I used these: http://www.amazon.co.uk/gp/product/B00BF3S83C) and only replaces the original fan. That means there's no need to print a whole new cover plate.