Reddit mentions of WINSINN 40mm Blower Fan 24V 4010 Turbine Turbo 40x10mm, with Air Guide Parts - High Speed (Pack of 5Pcs)

If you get an ender there are 4 safety things that I would do before I would print more than a test object or two and certainly before leaving it unattended

1. Inspect/replace the wire/xt60 from the PSU to the main board - 14awg stranded THHN with spades on one end and ferrules (or nothing) on the other - cost is less than $10 - this eliminates the XT60 connector all together ... this may not be needed on the newer ones since they seem to use the real XT60 vs knockoff ... an inspection is required in any case.. but for the average end user the connection really doesn't serve any purpose ..... https://www.th3dstudio.com/product/1-meter-replacement-12-gauge-ender-3-power-wires/ ..... if you really need the XT60 for some reason and you find the installed ones not real, loose , crimped on heating replace it with a real one or a real anderson powerpole connector....average current through it is about 10 amps.
   
2. Inspect/fix all the wires in the screw terminals on the main board - if they have solder on them clip the ends and either put into the screw terminals as bare copper OR better yet crimp ferrules on and put them back
   
3. Flash the firmware to enable thermal protection - even the new ones don't have it fully enabled - you need an Ardiuno or Raspberry PI + 6 dupont wires to hook up and do it
   https://www.th3dstudio.com/knowledgebase/th3d-unified-firmware-package/
   If you don't have an arduino or pi already laying around
   https://www.th3dstudio.com/product/arduino-uno-bootloader-flashing-kit/
   
4. Use an ohm meter and verify grounding from the ground pin on the power cord to the PSU chassis and the frame. There is a small chance it isn't properly connected.
   
   The first three are fire hazards that are simple to fix and don't cost much but are essential before leaving it unattended. The 4th item is a rare thing that could be a shock hazard caused by a loose screw or a misaligned insulation sheet in the PSU.
   
   All together the 4 fixes will take 30 minutes or less and $30 or less... It would be nice if Creality would do it from the factory but so far they haven't picked up everything.
   
   
   These are optional printed upgrades I would consider essential ... filament guides, cable chains, and part cooling nozzle....
   
   https://www.thingiverse.com/thing:3426272
   
   https://www.thingiverse.com/thing:3000563
   
   https://www.thingiverse.com/thing:2917932
   
   https://www.thingiverse.com/thing:3184816
   
   Read this guide:
   
   https://www.reddit.com/r/3Dprinting/wiki/newguideender3
   
   Other general notes: The stock sd card and fans are junk and you should expect to replace them within 3 to 6 months.... they may last longer but don't be surprised.... for the sd card anything up to 32g works... for the fans you need 24v 4010 size ball bearing fans.. links below will do the job but your milage may vary.
   
   https://smile.amazon.com/gp/product/B07L2WTH7H/
   
   https://smile.amazon.com/gp/product/B07D6WXVHW/

I just bought these not expecting them to be that great, but to my surprise they’re significantly more quiet than stock. They’re even more quiet than the 12v blower fan I was using with a buck converter.

https://www.amazon.com/dp/B07L2WTH7H/ref=cm_sw_r_cp_api_i_iHcZCbCVANNZZ