3d printer fan duct

I have ultimaker2-like 3d printer, which is quite similar to the regular ultimaker 2. I try to make the air flow more focusing on the nozzle region rather than the surrounding region. Also, I made shaped the path of the air flow in the way that the two output air flows are as even and symmetric as possible (and this part still printable using a one head printer). Unlike the original ultimaker2 duct which is made from metal, this is plastic. So I made it connect to the top part of the head and u