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https://github.com/MarlinFirmware/Marlin/blob/Development/Marlin/Configuration_adv.h

// A single Z stepper driver is usually used to drive 2 stepper motors.
// Uncomment this define to utilize a separate stepper driver for each Z axis motor.
// Only a few motherboards support this, like RAMPS, which have dual extruder support (the 2nd, often unused, extruder driver is used
// to control the 2nd Z axis stepper motor). The pins are currently only defined for a RAMPS motherboards.
// On a RAMPS (or other 5 driver) motherboard, using this feature will limit you to using 1 extruder.
//#define Z_DUAL_STEPPER_DRIVERS

#define Z_MIN_PIN 33
...
#define Z_MAX_PIN 32

//to use Z_DUAL_STEPPER_DRIVER in Marlin
#define Z2_STEP_PIN 29
#define Z2_DIR_PIN 28
#define Z2_ENABLE_PIN 39
...

Arduino: 1.6.3 (Windows 7), Плата"Arduino Mega or Mega 2560, ATmega2560 (Mega 2560)"

In file included from Configuration_adv.h:547:0,

from Configuration.h:821,

from Marlin.h:22,

from BlinkM.cpp:5:

SanityCheck.h:75:8: error: #error EXTRUDERS must be 1 with Z_DUAL_STEPPER_DRIVERS.

#error EXTRUDERS must be 1 with Z_DUAL_STEPPER_DRIVERS.

^

Ошибка компиляции.