I wanted a fan shroud with better part cooling, and couldn't find one that fit what I was looking for, so I pulled out a ruler, opened OpenSCAD, and started designing!
The original stl and ver2 stl are for the stock 30mm fan. There are a 30mm and 40mm variant of the ver3 version which rounds off corners and cleaned up some areas that bugged me.
The ver2 files have a redesigned ring and can now print in a right-side-up orientation, and should be fine with no support.
The ver3 files have the corners rounded off on the fan mount, and better supports 40mm fans. The 30mm variant should still print with no supports, but the overhang on the back for the 40mm variant will work better with supports.
This is still a work in progress and files will be updated as I make changes.
ver1 need supports for the spring clips.
ver2 should print fine with no supports.
ver3 30mm no supports, 40mm yes supports.