Creality CR-10 Fan duct

thingiverse

You can easily adjust the height, positioning the nozzle perfectly in the middle. A small incline at the top of the outlet helps guide air downwards effectively. Use high-quality filaments such as ABS or temperature-resistant materials to ensure optimal performance. Airflow appears to be balanced, though not perfect - it's sufficient for most applications. Version 2.4 has been improved with a slope and is now slightly higher than its predecessor.