12V DC 4010 Brushless Cooling Fan - 40mm x 40mm x 10mm

Prototyping and Engineering Tips from Robogears

• Airflow Direction: Always check the small arrows embossed on the side of the fan housing. One arrow indicates the direction of blade rotation, and the other shows the direction of airflow. For most 3D printers, you want the air blowing onto the heatsink.

• Finger Safety: Because these fans spin at high RPMs, the blades can be fragile and dangerous to fingers. Always use a 40mm "Fan Grill" or "Finger Guard" to prevent wires or stray fingers from obstructing the blades.

• PWM Speed Control: While this is a 2-pin fan, you can still control its speed using an Arduino or ESP32 by using a MOSFET (like the IRFZ44N) and a PWM signal. This allows you to reduce noise when the system is idling and ramp up cooling only when temperatures rise.

• Voltage Awareness: Do not run this fan at 24V if it is rated for 12V. While it may spin faster initially, the internal driver IC will overheat and fail within minutes. If your system is 24V (common in newer 3D printers), use a "Buck Converter" to drop the voltage to a steady 12V.

Package Includes

• 1 x 12V 4010 Cooling Fan (40x40x10mm)

Disclaimer: Ensure the input polarity is correct; reverse connection may damage the internal brushless controller. Keep the fan intake clear of dust and obstructions to maintain optimal cooling performance. Handle with care to avoid snapping the delicate plastic blades.