asse z non funzionante

#define DEFAULT_MAX_FEEDRATE          {500, 500, 5, 25}    // (mm/sec)

#define DEFAULT_AXIS_STEPS_PER_UNIT   {78.7402,78.7402,200.0*8/3,760*1.1}

/****************************************************************************************
* Arduino Mega pin assignment
*
****************************************************************************************/
#if MOTHERBOARD == 3 || MOTHERBOARD == 33 || MOTHERBOARD == 34 || MOTHERBOARD == 35 || MOTHERBOARD == 77 || MOTHERBOARD == 67 || MOTHERBOARD == 68
#define KNOWN_BOARD 1

//////////////////FIX THIS//////////////
#ifndef __AVR_ATmega1280__
 #ifndef __AVR_ATmega2560__
 #error Oops!  Make sure you have 'Arduino Mega' selected from the 'Tools -> Boards' menu.
 #endif
#endif


// uncomment one of the following lines for RAMPS v1.3 or v1.0, comment both for v1.2 or 1.1
// #define RAMPS_V_1_3
// #define RAMPS_V_1_0


#if MOTHERBOARD == 33 || MOTHERBOARD == 34 || MOTHERBOARD == 35 || MOTHERBOARD == 77 || MOTHERBOARD == 67 || MOTHERBOARD == 68

  #define LARGE_FLASH true

  #if MOTHERBOARD == 77
    #define X_STEP_PIN         54
    #define X_DIR_PIN          55
    #define X_ENABLE_PIN       38
    #define X_MIN_PIN           3
    #define X_MAX_PIN           -1   //2 //Max endstops default to disabled "-1", set to commented value to enable.

    #define Y_STEP_PIN         60
    #define Y_DIR_PIN          61
    #define Y_ENABLE_PIN       56
    #define Y_MIN_PIN          14
    #define Y_MAX_PIN          -1   //15

    #define Z_STEP_PIN         46
    #define Z_DIR_PIN          48
    #define Z_ENABLE_PIN       63
    #define Z_MIN_PIN          18
    #define Z_MAX_PIN          -1

    #define Y2_STEP_PIN        36
    #define Y2_DIR_PIN         34
    #define Y2_ENABLE_PIN      30

    #define Z2_STEP_PIN        36
    #define Z2_DIR_PIN         34
    #define Z2_ENABLE_PIN      30

    #define E0_STEP_PIN        26
    #define E0_DIR_PIN         28
    #define E0_ENABLE_PIN      24

    #define E1_STEP_PIN        36
    #define E1_DIR_PIN         34
    #define E1_ENABLE_PIN      30