Fan duct for Folger Tech Prusa i3

This is for standard Folger Tech Prusa i3 extruder (mk7 ???), fits a 40 mm fan. Apologies for the quality of print on the photo, my eyes bled too.

Performance of this thing is so so as a standard fan is not designed to push air through such small an opening. But it still boosted quality of print with PLA significantly for me, so as a quick and easy fix this will do.