Hotend fan duct upgrade - Ender 3 V2 by Svenn Inge | Download free STL model | Printables.com
Upgrading Ender 3 Fans with Noctua 40x20 for Quieter Printing - YouTube
PSA: When ordering new, quiet fans for your printer from Noctua, please note there is a small difference between NF-A4x20 and NF-A20 ... Ooops : r/3Dprinting