If an extruder from the previous step moves in the wrong direction power off your printer and disconnect the touchscreen.
In the aruino IDE go to the "configuration.h" tab.
Scroll down to line 863. (Go to File -> Preferences and check "Display line numbers")
#define INVERT_E0_DIR false
Replace false with true to change the motors direction. E0 is Hotend #1 and E1 is Hotend #2.
Re-upload the firmware.
Once uploaded, connect back the touch screen and power up the printer from the mains again.
Continue from previous step.
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