Hello world !
Since few days we are dealing with problem of calibration of extruder.
We are using wade exturder and white abs. We trying to pint but every time, it extrudes different amount of plastic.
Motor is working correctly. We heated it to 250 C and extruding with speed 30 mm/min.
Our setting are like this. Any ideas what is wrong ? ?

// X, Y, Z, E steps per unit - Metric Prusa Mendel with Wade extruder:
#define _AXIS_STEP_PER_UNIT {80, 80, 3200/1.75,700}

const int NUM_AXIS = 4; // The axis order in all axis related arrays is X, Y, Z, E
#define _MAX_FEEDRATE {40, 40, 4, 45} // (mm/sec)
#define _HOMING_FEEDRATE {1500,1500,120} // (mm/min) !!
#define _AXIS_RELATIVE_MODES {false, false, false, false}

// X, Y, Z, E maximum start speed for accelerated moves. E default values are good for skeinforge 40+, for older versions raise them a lot.
#define _ACCELERATION 1000 // Axis Normal acceleration mm/s^2
#define _RETRACT_ACCELERATION 2000 // Extruder Normal acceleration mm/s^2
#define _MAX_XY_JERK 5
#define _MAX_Z_JERK 0.0
#define _MAX_E_JERK 5.0 // (mm/sec)
//#define _MAX_START_SPEED_UNITS_PER_SECOND {25.0,25.0,0.2,10.0}
#define _MAX_ACCELERATION_UNITS_PER_SQ_SECOND {50,30,1,100} // X, Y, Z and E max acceleration in mm/s^2 for printing moves or retracts


Thanks

Did you check if the hobbed bolt/gear or whatever is driving the filament to see if it is slipping on the filament?

Check to see if you can smoothly extrude by hand, if not you probably have an extruder clog.

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