I got tired of listening to the loud cheap fan on the standard Chinese-made power supply that I use on many projects, so I made an adapter so I could use a near-silent magnetically suspended 120mm fan rather than the built in 60mm fan that comes with the unit. This did the trick. I used Blender to offset the small flange to near one of the corners so that, when installed, the fan is directly over the center of one end of the power supply instead of off to the side. Please note that technically this needs support when printed, but not practically. The small-end flange does get ugly when printed without support but it still does the job nicely when screws are put in from the metal side. The top of the flange is just fine and I'm not worried about the aesthetics of a power supply fan that I prefer to keep out of sight anyway. Printing with 4mm layers works just fine too. There is no need for fine detail so it is fine to go "quick and dirty".
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Low resolution is just fine. I used 0.4mm which is my lowest-res/fastest settings. No need for support if you don't care what it looks like. (still works anyway). Given its shape, it hardly needs any brim either.
II started with the customizer to get the OpenSCAD script and then went into Blender to skew the small flange as needed.