Creality Power Supply Fan Baffle for Ender 3/Ender 3 Pro w/John Cuccia's awesome dragon.

As Mr_Clever_Coyote states in the description of his original design, this reduces, or at the very least, redirects the sound coming from the 60mm fan of many 3D printer PSU's.  This part will also improve a 3D printers aesthetics IMO, and depending on the orientation and location of your mounted power supply, may also prevent debris from entering the PSU.

I've included two versions of this model.  Version 3 is intended for the 24v slim Meanwell PSU that comes with the Ender 3 Pro.  Version 4 is intended for the Ender 3 “non Pro” version, but I'd suggest looking at the orientation of the mounting screw holes for your PSU's fan and select the model who's orientation best serves your application.  I use version 3 on a pair of used Ender 3 Pro's I picked up recently with MW PSU's as well as the knock-off MW PSU I put in my CR-10 clone, as version 3 best suits the way I've got that machine set-up with the PSU mounted horizontally beneath the heated bed.  I did have to laugh when I received the knock-off PSU that I bought from Amazon for a significant discount over the Meanwell.  It appears identical to the slim PSU that came with my Sovol SV05.  Except for the orientation of the fan screw holes, they appear identical to the MW, and looking closer at the branding, and this is the funny part…  The brand on the knock-off PSU's is “NVV”  The small print, at a glance looks like it reads “MW”.  :)

As to avoid breaking the seal on the PSU, potentially voiding a warranty, remove one of the two screws holding the PSU's fan in place and attach the shroud loosely to the PSU in such a way that you'll be able to remove the other screw with the shroud partially in place, remove the other screw then turn the shroud to line up with the second hole and run the second screw then through the shroud, the second hole, and into the fan.

I print this model as oriented in the STL with normal supports to buildplate only.  After I remove the supports, which should come off relatively easily by tweaking the supports ever so lightly with a slotted screw driver, I run a wide tipped black sharpie over the company logo and then install it.  Alternatively, if you have a steady hand “which I don't these days”, you could paint atop the logo using your desired color, or, as I've done from time to time, one could spray a thin piece of cardboard with a shaker can in the desired color, then, while the paint is still good and wet, gently set the shround on to the wet paint with the logo facing down and wiggle it just a bit to transfer the wet paint to the logo.  If you're happy with the part in a single color, install it as is.

I personally think that having bare aluminum cased power supplies mounted atop a 3D printer frame, such as is the case for the Ender 3, looks trashy.  I think these color matched baffles reduce the trashiness and improve aesthetics, but I think inevitably I'll follow Sovol's example, painting the PSU's case flat black.  The first of the two Ender 3's I'm installing this part on, the green one, it arrived with a mutilated plastic base and it's aluminum shell needed to be straightened with a ball peen hammer before even installing it.  Please disregard the trashy appearance of the beat up power supply in the photo and focus on the awesome dragon.  :)