In our original design, the safety enclosure fan is controlled by DexArm via the PWM cable, which is using the same controlling IO as the 3D printing heater. But this design has a safety risk. When using the laser module, if the Arm 2*6Pin is connected to the 3D printing module by accident, the heater will be heated continuously with the highest power, which may cause damage to the 3D printing module, or burn your skin, or cause a fire.