In configuration.h
//============================== Movement Settings ============================
//=============================================================================
// @section motion
/**
* Default Settings
*
* These settings can be reset by M502
*
* You can set distinct factors for each E stepper, if needed.
* If fewer factors are given, the last will apply to the rest.
*
* Note that if EEPROM is enabled, saved values will override these.
*/
/**
* Default Axis Steps Per Unit (steps/mm)
* Override with M92
* X, Y, Z, E0 [, E1[, E2[, E3]]]
*/
//#define DEFAULT_AXIS_STEPS_PER_UNIT { 80, 80, 4000, 500 }
#define DEFAULT_AXIS_STEPS_PER_UNIT { 80, 80, 4000, 500 }
/**
* Default Max Feed Rate (mm/s)
* Override with M203
* X, Y, Z, E0 [, E1[, E2[, E3]]]
*/
#define DEFAULT_MAX_FEEDRATE { 300, 300, 5, 25 }