Bambu Lab X2D Hotend Cooling Fan Overview Cools the upper part of the hotend to prevent the filament from softening prematurely and causing blockages. Installation Please learn about the installation on Bambu Lab Wiki. In the Box - Hotend Fan *1 - Left Air Duct *1 - Right Air Duct *1 - BT2x5 Screw *3 - BT1.6x5 Screw *2 - BT3x7 Screw *1 Compatibility X2 Series