After my omnidirectional designs didn't really cut it in terms of airflow and the need for more hotend cooling arose (Copperfill, anyone?), I redesigned the original shroud. The outlet area is much increased compared to the omnidirectional designs. Additionally the top portion of the inlet is "bled" off and subsequently blown onto the heatbreak above the heater block. Please let me know how this works for you, we're all in this together in pursuit of the ultimate E3D shroud. ;D