The custom marlin firmware for the Dagoma DiscoEasy200 is now configured to use UBL with a 7x7 grid for bedlevel calibration :
#define AUTO_BED_LEVELING_UBL
#define UBL_MESH_INSET 1 // Mesh inset margin on print area
#define GRID_MAX_POINTS_X 7 // Don't use more than 15 points per axis, implementation limited.
#define GRID_MAX_POINTS_Y GRID_MAX_POINTS_X
#define UBL_PROBE_PT_1_X 39 // Probing points for 3-Point leveling of the mesh
#define UBL_PROBE_PT_1_Y 175
#define UBL_PROBE_PT_2_X 39
#define UBL_PROBE_PT_2_Y 30
#define UBL_PROBE_PT_3_X 170
#define UBL_PROBE_PT_3_Y 30
#define UBL_G26_MESH_VALIDATION // Enable G26 mesh validation
#define UBL_MESH_EDIT_MOVES_Z // Sophisticated users prefer no movement of nozzle