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This is a nonsense - define a fan, optimized for 3d printing .. - just go and get any radial fan 50x50x15 you are able to find ..ie https://www.lpfrg.com/de/radial-fan-50x50x15-assembly-hs/ .. if you are wiling to wait, no problem to go w aliexpress - this is where your printer came from in the first place ,Lol :)