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The problem of this version of Marlin can be shown in the following piece of code (which is inside EEPROM_RetrieveSettings function):

  for (short i=0;i<4;i++) 
  {
    axis_steps_per_unit[i]=tmp1[i];  
    max_feedrate[i]=tmp2[i];
    max_acceleration_units_per_sq_second[i]=tmp3[i];
    max_length[i]=tmp4[i];
  }

Here max_length is an array of 3 elements, not 4 (the X,Y and Z axes have a max length to avoid hitting the edge, but the extrude axis do not have such a limit - you should be able to extrude as many filament as you can supply), so the last statement in the loop overrides other variable(s).

The solution is

  for (short i=0;i<4;i++) 
  {
    axis_steps_per_unit[i]=tmp1[i];  
    max_feedrate[i]=tmp2[i];
    max_acceleration_units_per_sq_second[i]=tmp3[i];
    if(i<3)
        max_length[i]=tmp4[i];
  }

Or

  for (short i=0;i<4;i++) 
  {
    axis_steps_per_unit[i]=tmp1[i];  
    max_feedrate[i]=tmp2[i];
    max_acceleration_units_per_sq_second[i]=tmp3[i];
    if(i < sizeof(tmp4)/sizeof(tmp4[0]))
        max_length[i]=tmp4[i];
  }

Greate thanks to the answer writer and commenter. Without your help I couldn't follow the right track.

The problem of this version of Marlin can be shown in the following piece of code (which is inside EEPROM_RetrieveSettings function):

  for (short i=0;i<4;i++) 
  {
    axis_steps_per_unit[i]=tmp1[i];  
    max_feedrate[i]=tmp2[i];
    max_acceleration_units_per_sq_second[i]=tmp3[i];
    max_length[i]=tmp4[i];
  }

Here max_length is an array of 3 elements, not 4 (the X,Y and Z axes have a max length to avoid hitting the edge, but the extrude axis does not have such a limit - you should be able to extrude as many filament as you can supply), so the last statement in the loop overrides other variable(s).

The solution is

  for (short i=0;i<4;i++) 
  {
    axis_steps_per_unit[i]=tmp1[i];  
    max_feedrate[i]=tmp2[i];
    max_acceleration_units_per_sq_second[i]=tmp3[i];
    if(i<3)
        max_length[i]=tmp4[i];
  }

Or

  for (short i=0;i<4;i++) 
  {
    axis_steps_per_unit[i]=tmp1[i];  
    max_feedrate[i]=tmp2[i];
    max_acceleration_units_per_sq_second[i]=tmp3[i];
    if(i < sizeof(tmp4)/sizeof(tmp4[0]))
        max_length[i]=tmp4[i];
  }

Greate thanks to the answer writer and commenter. Without your help I couldn't follow the right track.

The problem of this version of Marlin can be shown in the following piece of code (which is inside EEPROM_RetrieveSettings function):

  for (short i=0;i<4;i++) 
  {
    axis_steps_per_unit[i]=tmp1[i];  
    max_feedrate[i]=tmp2[i];
    max_acceleration_units_per_sq_second[i]=tmp3[i];
    max_length[i]=tmp4[i];
  }

Here max_length is an array of 3 elements, not 4, so the last statement in the loop overrides other variable.

The solution is

  for (short i=0;i<4;i++) 
  {
    axis_steps_per_unit[i]=tmp1[i];  
    max_feedrate[i]=tmp2[i];
    max_acceleration_units_per_sq_second[i]=tmp3[i];
    if(i<3)
        max_length[i]=tmp4[i];
  }

Or

  for (short i=0;i<4;i++) 
  {
    axis_steps_per_unit[i]=tmp1[i];  
    max_feedrate[i]=tmp2[i];
    max_acceleration_units_per_sq_second[i]=tmp3[i];
    if(i < sizeof(tmp4)/sizeof(tmp4[0]))
        max_length[i]=tmp4[i];
  }

Greate thanks to the answer writer and commenter. Without your help I couldn't follow the right track.

The problem of this version of Marlin can be shown in the following piece of code (which is inside EEPROM_RetrieveSettings function):

  for (short i=0;i<4;i++) 
  {
    axis_steps_per_unit[i]=tmp1[i];  
    max_feedrate[i]=tmp2[i];
    max_acceleration_units_per_sq_second[i]=tmp3[i];
    max_length[i]=tmp4[i];
  }

Here max_length is an array of 3 elements, not 4 (the X,Y and Z axes have a max length to avoid hitting the edge, but the extrude axis do not have such a limit - you should be able to extrude as many filament as you can supply), so the last statement in the loop overrides other variable(s).

The solution is

  for (short i=0;i<4;i++) 
  {
    axis_steps_per_unit[i]=tmp1[i];  
    max_feedrate[i]=tmp2[i];
    max_acceleration_units_per_sq_second[i]=tmp3[i];
    if(i<3)
        max_length[i]=tmp4[i];
  }

Or

  for (short i=0;i<4;i++) 
  {
    axis_steps_per_unit[i]=tmp1[i];  
    max_feedrate[i]=tmp2[i];
    max_acceleration_units_per_sq_second[i]=tmp3[i];
    if(i < sizeof(tmp4)/sizeof(tmp4[0]))
        max_length[i]=tmp4[i];
  }

Greate thanks to the answer writer and commenter. Without your help I couldn't follow the right track.

The problem of this version of Marlin can be shown in the following piece of code (which is inside EEPROM_RetrieveSettings function):

  for (short i=0;i<4;i++) 
  {
    axis_steps_per_unit[i]=tmp1[i];  
    max_feedrate[i]=tmp2[i];
    max_acceleration_units_per_sq_second[i]=tmp3[i];
    max_length[i]=tmp4[i];
  }

Here max_length is an array of 3 elements, not 4, so the last statement in the loop overrides other variable.

The solution is

  for (short i=0;i<4;i++) 
  {
    axis_steps_per_unit[i]=tmp1[i];  
    max_feedrate[i]=tmp2[i];
    max_acceleration_units_per_sq_second[i]=tmp3[i];
    if(i<3)
        max_length[i]=tmp4[i];
  }

Or

  for (short i=0;i<4;i++) 
  {
    axis_steps_per_unit[i]=tmp1[i];  
    max_feedrate[i]=tmp2[i];
    max_acceleration_units_per_sq_second[i]=tmp3[i];
    if(i < sizeof(tmp4)/sizeof(tmp4[0]))
        max_length[i]=tmp4[i];
  }

The problem of this version of Marlin can be shown in the following piece of code (which is inside EEPROM_RetrieveSettings function):

  for (short i=0;i<4;i++) 
  {
    axis_steps_per_unit[i]=tmp1[i];  
    max_feedrate[i]=tmp2[i];
    max_acceleration_units_per_sq_second[i]=tmp3[i];
    max_length[i]=tmp4[i];
  }

Here max_length is an array of 3 elements, not 4, so the last statement in the loop overrides other variable.

The solution is

  for (short i=0;i<4;i++) 
  {
    axis_steps_per_unit[i]=tmp1[i];  
    max_feedrate[i]=tmp2[i];
    max_acceleration_units_per_sq_second[i]=tmp3[i];
    if(i<3)
        max_length[i]=tmp4[i];
  }

Or

  for (short i=0;i<4;i++) 
  {
    axis_steps_per_unit[i]=tmp1[i];  
    max_feedrate[i]=tmp2[i];
    max_acceleration_units_per_sq_second[i]=tmp3[i];
    if(i < sizeof(tmp4)/sizeof(tmp4[0]))
        max_length[i]=tmp4[i];
  }

Greate thanks to the answer writer and commenter. Without your help I couldn't follow the right track.