Keep heat where it belongs with the genuine QIDI Max4 Hotend Cooling Fan. This OEM replacement fan cools the hotend heatsink to help prevent premature filament softening, heat creep, and frustrating clogs during long or high-temperature prints. With 4-pin PWM control and RPM feedback, it is designed for proper integration with the Max4 toolhead and makes an ideal replacement or spare for minimizing printer downtime.