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Noctua NF-A4x10 PWM 40mm x 10mm Ultra Quiet Silent Fan 3-Pin Premium Cooling Fan for CR-10 S4/CR-10 S/CR-10/CR-10 S5/CR-10 mini 3D Printer - Walmart.com
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Noctua NF-A14 5V PWM, Premium Quiet Fan with USB Power Adaptor Cable, 4-Pin, 5V Version (140mm, Brown) - Newegg.com
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