level

  //Enable this to sample the bed in a grid (least squares solution)
  // Note: this feature generates 10KB extra code size
  //#define AUTO_BED_LEVELING_GRID

  #ifdef AUTO_BED_LEVELING_GRID

    #define LEFT_PROBE_BED_POSITION 85   //x1  (x1, y1) (x2,y1) (x2,y2) (x2, y2)
    #define RIGHT_PROBE_BED_POSITION 168 //x2
    #define FRONT_PROBE_BED_POSITION 20   //y1
    #define BACK_PROBE_BED_POSITION 190 //y2

    #define MIN_PROBE_EDGE 10 // The probe square sides can be no smaller than this

    // Set the number of grid points per dimension
    // You probably don't need more than 3 (squared=9)
    #define AUTO_BED_LEVELING_GRID_POINTS 3

  #else  // !AUTO_BED_LEVELING_GRID

      // Arbitrary points to probe. A simple cross-product
      // is used to estimate the plane of the bed.
      #define ABL_PROBE_PT_1_X 15
      #define ABL_PROBE_PT_1_Y 180
      #define ABL_PROBE_PT_2_X 15
      #define ABL_PROBE_PT_2_Y 20
      #define ABL_PROBE_PT_3_X 170
      #define ABL_PROBE_PT_3_Y 20

  #endif // AUTO_BED_LEVELING_GRID