Mesh Bed Leveling (1.1.2)

[rvieirax]

Even when you calibrate the printer with manual leveling, the two z-axis motors become immobile when each layer is printed. Printer: prusa i3

[Roxy-3D]

I'm guessing from what you write that when you are not printing a layer the two z-motors are mobile.

[rvieirax]

Dear, thank you for your interest in helping. I will describe the problem: If the table is not perfectly flat, the z-axis motors must compensate for this irregularity by moving the extruder away from the table so that the extruder-table distance is constant. Problem: The firmware is configured for Mesh Bed Leveling; The calibration of the table-extruder distance is done following the steps of the LCD; During printing the z-axis motors do not move to compensate for table irregularities.

[Roxy-3D]

Did you activate the system? Did you activate the: MIN_SOFTWARE_ENDSTOPS ?

// If enabled, axes won't move below MIN_POS in response to movement commands.
#define MIN_SOFTWARE_ENDSTOPS
// If enabled, axes won't move above MAX_POS in response to movement commands.
#define MAX_SOFTWARE_ENDSTOPS

If you activate the MIN_SOFTWARE_ENDSTOPS that will keep the nozzle from going below 0.000 to track the bed if it dips.

In order to use the original mesh leveling, the machine needs to be homed, and then G29 S2's need to be performed. Did you get the

          SERIAL_PROTOCOLLNPGM("Mesh probing done.");
          BUZZ(100, 659);
          BUZZ(100, 698);
          mesh_probing_done();

message at the end of the probing? If not... The mesh will not be active.

[rvieirax]

The EndStops are enabled. After manual table calibration the printer beeps and the message "Leveling Done!"

But it does not work.

The code:

//===========================================================================
//=============================== Bed Leveling ==============================
//===========================================================================
// @section bedlevel

/**
 * Choose one of the options below to enable G29 Bed Leveling. The parameters
 * and behavior of G29 will change depending on your selection.
 *
 *  If using a Probe for Z Homing, enable Z_SAFE_HOMING also!
 *
 * - AUTO_BED_LEVELING_3POINT
 *   Probe 3 arbitrary points on the bed (that aren't collinear)
 *   You specify the XY coordinates of all 3 points.
 *   The result is a single tilted plane. Best for a flat bed.
 *
 * - AUTO_BED_LEVELING_LINEAR
 *   Probe several points in a grid.
 *   You specify the rectangle and the density of sample points.
 *   The result is a single tilted plane. Best for a flat bed.
 *
 * - AUTO_BED_LEVELING_BILINEAR
 *   Probe several points in a grid.
 *   You specify the rectangle and the density of sample points.
 *   The result is a mesh, best for large or uneven beds.
 *
 * - AUTO_BED_LEVELING_UBL (Unified Bed Leveling)
 *   A comprehensive bed leveling system combining the features and benefits
 *   of other systems. UBL also includes integrated Mesh Generation, Mesh
 *   Validation and Mesh Editing systems. Currently, UBL is only checked out
 *   for Cartesian Printers. That said, it was primarily designed to correct
 *   poor quality Delta Printers. If you feel adventurous and have a Delta,
 *   please post an issue if something doesn't work correctly. Initially,
 *   you will need to set a reduced bed size so you have a rectangular area
 *   to test on.
 *
 * - MESH_BED_LEVELING
 *   Probe a grid manually
 *   The result is a mesh, suitable for large or uneven beds. (See BILINEAR.)
 *   For machines without a probe, Mesh Bed Leveling provides a method to perform
 *   leveling in steps so you can manually adjust the Z height at each grid-point.
 *   With an LCD controller the process is guided step-by-step.
 */
//#define AUTO_BED_LEVELING_3POINT
//#define AUTO_BED_LEVELING_LINEAR
//#define AUTO_BED_LEVELING_BILINEAR
//#define AUTO_BED_LEVELING_UBL
#define MESH_BED_LEVELING

/**
 * Enable detailed logging of G28, G29, M48, etc.
 * Turn on with the command 'M111 S32'.
 * NOTE: Requires a lot of PROGMEM!
 */
//#define DEBUG_LEVELING_FEATURE

#if ENABLED(MESH_BED_LEVELING) || ENABLED(AUTO_BED_LEVELING_BILINEAR) || ENABLED(AUTO_BED_LEVELING_UBL)
  // Gradually reduce leveling correction until a set height is reached,
  // at which point movement will be level to the machine's XY plane.
  // The height can be set with M420 Z<height>
  #define ENABLE_LEVELING_FADE_HEIGHT
#endif

#if ENABLED(AUTO_BED_LEVELING_LINEAR) || ENABLED(AUTO_BED_LEVELING_BILINEAR)

  // Set the number of grid points per dimension.
  #define GRID_MAX_POINTS_X 3
  #define GRID_MAX_POINTS_Y GRID_MAX_POINTS_X

  // Set the boundaries for probing (where the probe can reach).
  #define LEFT_PROBE_BED_POSITION 30
  #define RIGHT_PROBE_BED_POSITION 170
  #define FRONT_PROBE_BED_POSITION 50
  #define BACK_PROBE_BED_POSITION 170

  // The Z probe minimum outer margin (to validate G29 parameters).
  #define MIN_PROBE_EDGE 10

  // Probe along the Y axis, advancing X after each column
  //#define PROBE_Y_FIRST

  #if ENABLED(AUTO_BED_LEVELING_BILINEAR)

    // Beyond the probed grid, continue the implied tilt?
    // Default is to maintain the height of the nearest edge.
    //#define EXTRAPOLATE_BEYOND_GRID

    //
    // Experimental Subdivision of the grid by Catmull-Rom method.
    // Synthesizes intermediate points to produce a more detailed mesh.
    //
    //#define ABL_BILINEAR_SUBDIVISION
    #if ENABLED(ABL_BILINEAR_SUBDIVISION)
      // Number of subdivisions between probe points
      #define BILINEAR_SUBDIVISIONS 3
    #endif

  #endif

#elif ENABLED(AUTO_BED_LEVELING_3POINT)

  // 3 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

#elif ENABLED(AUTO_BED_LEVELING_UBL)

  //===========================================================================
  //========================= Unified Bed Leveling ============================
  //===========================================================================

  #define UBL_MESH_INSET 1          // Mesh inset margin on print area
  #define GRID_MAX_POINTS_X 10      // 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       // These set the probe locations for when UBL does a 3-Point leveling
  #define UBL_PROBE_PT_1_Y 180      // of the mesh.
  #define UBL_PROBE_PT_2_X 39
  #define UBL_PROBE_PT_2_Y 20
  #define UBL_PROBE_PT_3_X 180
  #define UBL_PROBE_PT_3_Y 20
  #define UBL_G26_MESH_VALIDATION   // Enable G26 mesh validation
  #define UBL_MESH_EDIT_MOVES_Z     // Sophisticated users prefer no movement of nozzle

#elif ENABLED(MESH_BED_LEVELING)

  //===========================================================================
  //=================================== Mesh ==================================
  //===========================================================================

  #define MESH_INSET 20          // Mesh inset margin on print area
  #define GRID_MAX_POINTS_X 3    // Don't use more than 7 points per axis, implementation limited.
  #define GRID_MAX_POINTS_Y GRID_MAX_POINTS_X

  //#define MESH_G28_REST_ORIGIN // After homing all axes ('G28' or 'G28 XYZ') rest Z at Z_MIN_POS

#endif // BED_LEVELING

/**
 * Use the LCD controller for bed leveling
 * Requires MESH_BED_LEVELING or PROBE_MANUALLY
 */
#define LCD_BED_LEVELING

#if ENABLED(LCD_BED_LEVELING)
  #define MBL_Z_STEP 0.025    // Step size while manually probing Z axis.
  #define LCD_PROBE_Z_RANGE 4 // Z Range centered on Z_MIN_POS for LCD Z adjustment
#endif

/**
 * Commands to execute at the end of G29 probing.
 * Useful to retract or move the Z probe out of the way.
 */
//#define Z_PROBE_END_SCRIPT "G1 Z10 F12000\nG1 X15 Y330\nG1 Z0.5\nG1 Z10"

// @section homing

// The center of the bed is at (X=0, Y=0)
//#define BED_CENTER_AT_0_0

// Manually set the home position. Leave these undefined for automatic settings.
// For DELTA this is the top-center of the Cartesian print volume.
//#define MANUAL_X_HOME_POS 0
//#define MANUAL_Y_HOME_POS 0
//#define MANUAL_Z_HOME_POS 0

// Use "Z Safe Homing" to avoid homing with a Z probe outside the bed area.
//
// With this feature enabled:
//
// - Allow Z homing only after X and Y homing AND stepper drivers still enabled.
// - If stepper drivers time out, it will need X and Y homing again before Z homing.
// - Move the Z probe (or nozzle) to a defined XY point before Z Homing when homing all axes (G28).
// - Prevent Z homing when the Z probe is outside bed area.
//#define Z_SAFE_HOMING

#if ENABLED(Z_SAFE_HOMING)
  #define Z_SAFE_HOMING_X_POINT ((X_MIN_POS + X_MAX_POS) / 2)    // X point for Z homing when homing all axis (G28).
  #define Z_SAFE_HOMING_Y_POINT ((Y_MIN_POS + Y_MAX_POS) / 2)    // Y point for Z homing when homing all axis (G28).
#endif

// Homing speeds (mm/m)
#define HOMING_FEEDRATE_XY (50*60)
#define HOMING_FEEDRATE_Z  (4*60)

[BlackLightUK]

M420 V1 should print out the state of the mesh that's currently in use. If it's all zeroes, then you didn't store the mesh to EEPROM before you started printing.

If the mesh has all the offsets listed, then you will probably need an M420 S1 in your startup gcode (which turns on the bed levelling), but put this after a G28 (home XYZ) as a home will turn off the levelling routine.

[rvieirax]

I inserted the M420 S1 code and the leveling function is working fine. Thanks for the help.

[carlonb]

Yes, in this way it's working but why in previous release (i do not remember wich one) was not necessary manually put M420 S1 in the object g code? I think enable the BED leveling automatically when we launch the print without add the g code M420 S1 is simpler.

[fiveangle]

[discussing different leveling scheme - deleted]

[Roxy-3D]

I think enable the BED leveling automatically when we launch the print without add the g code M420 S1 is simpler.

Historically... G29 always is disabled by a G28. And there is controversy about the fact that G28 preserves the Active/Disabled state of UBL. But with UBL, you can do a M500 and save the state as 'Active', and never even put a G29 in your Slic3r's Startup GCode. That is how I operate.

Bed leveling is alive and working when my machine comes out of power up.

[carlonb]

@Roxy-3D - Thanks for the clarify, can you give me an hint where, in the code, the G28 received command from SD card will disable the G29 Mesh/UBL ? I want to try to mod by myself the code to experimenting and avoid to add M420 S1 to the startup gcode of slic3er. Or better the diff with one of previous code where G28 do not deactivate the MESH enable. Bye carlo

[BlackLightUK]

All that springs to mind here is that I really need to invest in a decent bed sensor...... G28-and-go sounds really quite appealing at this point in time :)

[Roxy-3D]

Thanks for the clarify, can you give me an hint where, in the code, the G28 received command from SD card will disable the G29 Mesh/UBL ?

It doesn't matter if it is from SD-Memory card or from a serial command. G28 disables leveling here: https://github.com/MarlinFirmware/Marlin/blob/bugfix-1.1.x/Marlin/Marlin_main.cpp#L3709

And in the UBL case... G28 turns it back on here: https://github.com/MarlinFirmware/Marlin/blob/bugfix-1.1.x/Marlin/Marlin_main.cpp#L3854

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