BIBO Touch Ring Shroud for Single Extruder

I have two BIBO Touch 3d printers and I decided to remove the left extruder and attach a better cooling fan. It's in two parts because of the tight space where the left extruder used to sit. Print using ABS or other high temp filament to prevent the part from warping. PLA will not work. The stock cooling fan(s) are dismal at best.

Layer Height: .2 or .3
Shells: 2 or 3
Infill: 25 percent