dual extrusion one motor with dual drive gear

thingiverse

My configuration : Material Tronxy X5S with original card , with lot of adaptation to accept dual extruder and dual head pivoting and bl-touch. For this project , to use one stepper for two filaments list of parts: Stepper S3003 x1 Connector PC4-M5 x2 kit Prusa i3 MK2/MK3 x2 divers : screw washer , and spring to switch motor , need to configure marlin to dual motor , for that : _#define EXTRUDERS 2 in case of single nozzle _#define INVERT_E0_DIR false _#define INVERT_E1_DIR true < important _#define SINGLENOZZLE in case of twice nozzle _#define TEMP_SENSOR_0 1 _#define TEMP_SENSOR_1 1 _#define INVERT_E0_DIR false _#define INVERT_E1_DIR true < important _#define X_PROBE_OFFSET_FROM_EXTRUDER -33 < depending your config _#define Y_PROBE_OFFSET_FROM_EXTRUDER +44 < depending your config _#define Z_PROBE_OFFSET_FROM_EXTRUDER 0 < depending your config on your mother card parameter for me file "pins_SANGUINOLOLU_11.h" _#define E0_STEP_PIN 1 _#define E0_DIR_PIN 0 _#define E1_STEP_PIN 1 < important _#define E1_DIR_PIN 0 < important use this code to simplify 3D to change extruder position {IF NEWTOOL=1}M280 P1 S15 {IF NEWTOOL=0}M280 P1 S70 link to Fusion 360 https://a360.co/39LcOoC