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
The Best Ender 3 (V2/Pro/S1) Fan Upgrades of 2023 | All3DP
3D printed Ender 3, 3 V2, 3 pro, 3 max, dual 40mm axial fan hot end duct / fang. CR-10, Micro Swiss direct drive and bowden compatible. No support needed for printing •
Options for making Ender 3 v2 fans quieter - 3D Printing Stack Exchange