This is a hot end fan duct for creality CR-8 3D printer. No supports needed. Recommend printed by ABS meteria. Copper tape is for isolation radiation heat to protect main body. The fan protection cover is more beauty but effect some wind flow. You can choice to use it either or not. Also you will need 17mm M3 screw to lock fan protection cover or 12mm M3 without it.
CR8_Fan_Duct_30P.STL is distribution of 30% wind to the hot end sink, and the rest to object.
CR8_Fan_Duct_50P.STL is distribution of 50% wind to the hot end sink, and the rest to object.
Choose one you needed.