Common parameters settings of firmware, please refer to:
http://www.geeetech.com/forum/viewtopic.php?f=13&t=17194
8.2 How to change the motor direction in firmware?
In the configuration.h tab of firmware, find the following codes. Change the true of corresponding
axis into false or false into true, and save the firmware and burn into the printer. ( Because you don’t
know the firmware which has been burned by mother board is true or false, it may be necessary to
burn both of the two parameters.)
#define INVERT_X_DIR true
#define INVERT_Y_DIR false
#define INVERT_Z_DIR true
#define INVERT_E0_DIR false