This is a modified version of e-squizo's MK7 fan shroud with the vent extended down from 20mm to 27mm which works perfect on my Folger Tech 2020 i3.
Follow his instructions for mounting, basically replace the fan with the shroud, then mount the fan to the shroud with two 3mm bolts. He said to tap them, but the bolts just screw right into the plastic no problem.
Also to keep with his original upload, I have provided my modified file and the scad file.
*NOTE: the fan is mounted backwards in the photos, I fixed it right after I took them. The sticker should be facing the heatsink.