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Umlife 4Pcs 3D Printer Cooling Fan 40Mmx40Mmx10Mm Oil Bearing Blower Fan Dc 12V Brushless Cooling Fan With 2 Pin Terminal For Hotend Extruder Heatsinks Makerbot Mk7 Mk8 Cpu Chip (12V 0.08A)This helps to prevent the heat from the nozzle traveling too far upwards. Without this fan, the filament could get soft above the heater block, which leads to ex..