The cooling fan is used to cool and reduce the temperature of the hot end ceramic heater. The cooling fan is a high-speed rotating component, do not touch it during operation. In addition, our hot end cooling fan will automatically shut down after being stuck for 1-3 seconds at rated voltage. The circuit attempts to restart within 2-6 seconds. Even if the rotor is locked for more than 72 hours, no damage will be caused. The only difference between the P1 series version and the XI 1 series version is the structure of the terminal connector. With the update of the P1 version structure, the reliability of the terminal connector under extreme conditions has been improved. Note: Due to different production batches, the actual color may vary slightly, which does not affect the use. Colour:As Shown Material:ABS Package Contents: 1 * X1 bearing 1 * P1P bearing Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.