Hi Veesta,
It depends on the part you are printing. If you have very pronounced overhang angle, you might want to use a very focused air flow at the nozzle. Smaller parts will also need a very focused cooling.
Larger parts can benefit from a less precise cooling since the movement of the print head will end up cooling it eventually.
It is better to have a 360° cooling around the hotend, because if you don't, you will have a difference in part quality depending on the orientation.
DYZE DESIGN
Hotends, Extruders, Liquid Cooling and Accessories.