Just upgraded the mainboard fan, to a Noctua NF-A4x20. Have gone from rattly jet engine to a whisper, no soldering connectors either which was a nice bonus! : r/MPSelectMiniOwners
Noctua NF-A4x20 5V PC fan Black (W x H x D) 40 x 40 x 20 mm | Conrad.com
Creality Noctua NF-A4x10 PWM 40mm x 10mm Ultra Quiet Silent Fan 12V 3-Pin Premium Cooling Fan for CR-10 S4/CR-10 S/CR-10/CR-10 S5/CR-10 mini 3D Printer
Noctua NF-A4x10 PWM 40mm x 10mm Ultra Quiet Silent Fan 3-Pin Premium Cooling Fan for CR-10 S4/CR-10 S/CR-10/CR-10 S5/CR-10 mini 3D Printer - Walmart.com
Noctua Premium Fan NF-A4x10 5V – Ultimate Mister FPGA