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I only had my ANET A8 up and running for two days. I also have the problem with the whistling noise coming from the blower but the problem is not the blower itself it's the cooler duct. The top part of the duct which inserts into the blower is too long and it can actually touch the blades of the blower while they are spinning. when the print I'd doing at the moment is finished I intend to file the top down a couple of millimetres I'm sure that this will prevent the noise.