Hi, My batch 3 original seems to be having a bit of issues with the fan making a sort of growling noise at low speeds occasionally. Will disassemble to make sure nothing is in there when I have time but checked to make sure I could buy a fan and see only the whole assembly is for sale.
I would like to suggest an option to purchase only the fan its self, not the whole assembly as the fan will of course fail before the copper and I imagine the cost of the fan is only a small part of the $40 assembly cost.