Reddit mentions of WINSINN 40mm Fan 24V Dual Ball Bearing Brushless 4010 40x10mm - High Speed (Pack of 5Pcs)

Outside of the things others have mentioned (springs, tubing, couplers, SKR, BMG, etc.) - if you don't already have some good tools/spare parts you can use this time to invest in some.

• Some superlube for bearings/z-rod/etc
  
• Ferrules & crimp (great if you want to swap boards and have 'proper' cabling)
  
• A heavier duty 'get off the damn bed' thingy
  
• Reusable cable ties (save the ocean or some shit)
  
• Deburr tool
  
• M2/M3/M4 bolt set with T-nuts (great if you want to print some add-ons that attach to the extrusions)
  
• Different bed surfaces if you want to experiment
  
• Microfiber cloths for cleaning things
  
• Tooth brush and some orange cleaner for cleaning up that z-rod
  
• LED lightbar or some other form of lighting
  
• Extra hot end socks, nozzles, thermistors, heating elements (better to have one or two on hand then wait a while!)
  
• 14/12 awg silicone wire for mains connection (great with spades & ferrules!)
  
• Soldering iron, cabling, heatshrink (if you want to swap fans or do any other wire splicing activities)
  
• Ball bearing 4010 fans (or 4020, or whatever size you mod to - IMO go for 24v and avoid noctua/buck converter shenanigans)

These are the files you'll need for the Bullseye/Petsfang. There's also a chart in the download that should help you determine what you need for any accessories you're adding (ABL)/checking my math. Just locate the hotend setup you have at the top and look at that column for what you need.

Bullseye: BULLSEYE_BASE_CREALITY_9.27 & BULLSEYE_DUCT_9.27

Petsfang: CR10_STOCK_MANUAL_CASE_V11.3 & CR10TEVO_5015_DUCT_V7.5

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I cut the existing wires for the fans and wired in a connector for easy replacement down the line. Just make sure you get the 24V and not the 12V.

Blowers: https://www.amazon.com/gp/product/B07DB7DLMM/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

Fans: https://www.amazon.com/gp/product/B07DB5H6K1/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

I designed and printed a way to mount a 4010 fan (not blower) to the Bullseye duct. I was surprised but it actually prints as good or slightly better than the stock fan on that same duct. However, it is a lot quieter.

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I am sure a 5015 would be better and I think I will upgrade later. However, this certainly made my printer quieter and doesn't seem to have degraded print quality. If you are upgrading for quiet and don't want to buy both fans and a blower this is a good option.

Here is the thing:

https://www.thingiverse.com/thing:3453029

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Here are the fans:

https://www.amazon.com/gp/product/B07DB5H6K1/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1