Plugin fan duct for half stepper

Created this fan duct for everybody who modified their Flashforge or similar printers to a single extruder by using this half stepper thing.
http://www.thingiverse.com/thing:551916

My fan duct works when you DO NOT switch the extruder elements around. It plugs in where the left extruder was. No need for screws. Just plug and play.

The reason I made this is when you do switch the extruder element around as required by the half stepper thing, the extruder gets very close to the plastic carriage that supports the whole assembly. I was afraid things will bend or melt because of the heat!

By leaving the right extruder in place and not switching it with the left extruder, this is not a problem anymore. But then the supplied fan ducts with the half stepper don't fit. So this is where this model comes in.

I also had various other fan ducts melt / deform already because they were very close to the extruder and were very thin. This one has not melted yet. Do NOT print this with PLA