Dual Z steppers and dual extruder

Aurier

My machine is a home built cartesian using AtMega 2560 and Ramps1.4 board and dual extruders into a Y/ E3D hotend. Was using Marlin until I upgraded to dual Z steppers and a BLTouch (sadly my second extruder no longer works). Can Repetier firmware be setup to use a stepper expander board with the Ramps 1.4. If so how does one go about configuring the pins for the expander board?

Repetier

Yes it is quite easy. In config tool select for example E2 (third extruder) as motor. That will result in something like

#define EXT2_STEP_PIN ORIG_E2_STEP_PIN

#define EXT2_DIR_PIN ORIG_E2_DIR_PIN

#define EXT2_ENABLE_PIN ORIG_E2_ENABLE_PIN

now these variables are undefined, so in manual additions in config tool you add

#undef EXT2_STEP_PIN
#undef EXT2_DIR_PIN
#undef EXT2_ENABLE_PIN

#define EXT2_STEP_PIN 10

#define EXT2_DIR_PIN 11

#define EXT2_ENABLE_PIN 12

with 10-12 replaced by correct pin number. That's all required.