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to replace the double gear extruder, the direction of the motor and the extruder pulse shall be modified according to its own machine:
First, the method of motor direction modification:
1) Firmware changes the direction of the E0 motor:
// For direct drive extruder v9 set to true, for geared extruder set to false.
#define INVERT_ E0_ DIR false
2) Change the line sequence of motor
Two interchanges in the middle and two on the side
Second, extruder pulse
1) Firmware modification extruder pulse:
#define DEFAULT_ AXIS_ STEPS_ PER_ UNIT { 80, 80, 400, 146 }
2) Send G code (can be sent by slicing software command):
M92 E146
M500