motori che non vanno

[Oraziomax]

salve gente. volevo chiedervi aiuto sulla  mia  stampante r2 mi sta facendo sclerare  . i motori  non vogliono andare  fanno solo rumore e vanno a scatti . ho registrato  i driver : Y- X -estrusore a 075 v .e Z a 1v.   i drive sono dei A4988 . i motori dei nema 17  a 1,7A .  il firmware e merlin kimbra per r2 .vi chiedo se mi potete aiutare perche non so cosa spostare  ed ho paura di bruciare qualcosa . questi sono i settaggi  delle accelerazioni : / MOVEMENT SETTINGS
#define HOMING_FEEDRATE {140*60,140*60,3*60,0}      // set the homing speeds (mm/min)

// default settings
#define DEFAULT_AXIS_STEPS_PER_UNIT {160,160,6400,1240,1240,625,625}      // X, Y, Z, E0, E1, E2, E3 default steps per unit
#define DEFAULT_MAX_FEEDRATE {300,300,4,50,50,100,100}      // X, Y, Z, E0, E1, E2, E3 (mm/sec)
#define DEFAULT_RETRACTION_MAX_FEEDRATE {100,100,150,150}      // E0, E1, E2, E3 (mm/sec)
#define DEFAULT_MAX_ACCELERATION {3000,3000,50,3000,3000,3000,3000}      // X, Y, Z, E0, E1, E2, E3 maximum start speed for accelerated moves.

#define DEFAULT_ACCELERATION 2500      // X, Y, Z and E max acceleration in mm/s^2 for printing moves
#define DEFAULT_RETRACT_ACCELERATION 5000      // E max acceleration in mm/s^2 for retracts
#define DEFAULT_TRAVEL_ACCELERATION 3000      // X, Y, Z acceleration in mm/s^2 for travel (non printing) moves

// Offset of the extruders (uncomment if using more than one and relying on firmware to position when changing).
// The offset has to be X=0, Y=0 for the extruder 0 hotend (default extruder).
// For the other hotends it is their distance from the extruder 0 hotend.
//#define HOTEND_OFFSET_X {0.0, 5.00, 0.0, 0.0} // (in mm) for each extruder, offset of the hotend on the X axis
//#define HOTEND_OFFSET_Y {0.0, 5.00, 0.0, 0.0} // (in mm) for each extruder, offset of the hotend on the Y axis

// The speed change that does not require acceleration (i.e. the software might assume it can be done instantaneously)
#define DEFAULT_XYJERK 15      // (mm/sec)
#define DEFAULT_ZJERK 0.4      // (mm/sec)
#define DEFAULT_EJERK 5      // (mm/sec)