Cooling Fan Box for TAZ3

Updated: This cooling box is for TAZ3 3D printer, it uses a 50 mm muffin fan, it has three outlets: one outlet is for cooling extruded filament (good for PLA printing), one for keeping the extruder motor above it cool, and one for giving active cooling to the hot-end heat sink. The update is the addition of exhaust hole to the hot-end because I found that active cooling enables you to use more different brands of ABS filaments without which the Hobbed Bolt likes to dig into the filament too much