Interesting... ...so in this thread, I'm making my recommendations for the C2 and it looks like Coby took the bait and used my suggestion on the fan shroud to adjust the part fans to be mounted diagonally rather than horizontally. What you're missing here is my offline discussion via PM in which I shared a drawing with him. (Sweet...!) It looks like he's bringing the right-side cooling closer to the first extruder, so it should outperform the original, I'm sure. Looks like he's not used the internal surfacing to direct air flow for the hotend... so I think I'll redesign for my own needs, especially since I'll have two extruders.