Note:1. This module can ONLY be used in LERDGE-S Board.Product Description:The dual extruder module for Lerdge board can achieve two-color printing, RGB control and Laser engraving functions(these two functions are extensible, but not available at this moment, will accomplish them ASAP) etc. . Please directly insert the module into the motherboard extension interfaces and then restart, the system will identify the double-headed mode according to the components on the module.Tips: If you are new for using the dual extruder, we suggest to use 2 in 1 out hotend, (There are also some hotends using 2 in 1 out for dual color switching print). 2 in 2 out has higher requirements in mechanical part, which is more difficult to adjust.H2 Sensor: Connect the second hotend sensor(thermistor)Hotend2: Connect the second hotend heaterE2 motor: Connect the second extruder stepper motorFan1: Connect the second hotend throat cooling fan (the fan starts working when the second hotend is heated or the temperature is above 40 degrees Celsius)Fan2: second hotend model cooling fanA: laser expansion interface (software is not yet open)B: laser expansion interface (software is not yet open)+ RGB: color light bar interface (software is not yet open)2 in 2 out modeWhen the Lerdge motherboard power on with the dual extruder module plugged in, the system can successfully read the effective temperature of the second hotend, and the main UI will first show the second hotend information.Enter the "Model Settings" -> a specific "model" -> "Advanced Settings" -> "Hotend 2 setting", measure and set up the offset position for Hotend 2 in the X, Y axis and Hotend 1. The positive and negative of the offset are determined by the specific coordinate system of the machine.Go to "Motor Settings" and "Step Value Settings" to modify the step value of the Hotend 2 extruder motor.