Unwanted Z movement when ABL_BILINEAR_SUBDIVISION is enabled.

[ahmetcemturan]

Bug Description

When moving in X axis the Z axis makes a sudden jerk when it is passing the 4th (I measure a grid of 5x5 points) probe point. It is not affected by Extrapolate beyond grid. Everything works fine when ABL_BILINEAR_SUBDIVISION is disabled.

This is the same as https://github.com/MarlinFirmware/Marlin/issues/14963#. I don't know why it was marked as fixed.

Configuration Files

*//#define AUTO_BED_LEVELING_3POINT //#define AUTO_BED_LEVELING_LINEAR

define AUTO_BED_LEVELING_BILINEAR

//#define AUTO_BED_LEVELING_UBL //#define MESH_BED_LEVELING

/**

• Normally G28 leaves leveling disabled on completion. Enable
• this option to have G28 restore the prior leveling state. */

  define RESTORE_LEVELING_AFTER_G28

  //#define ENABLE_LEVELING_AFTER_G28

/**

• 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 ANY(MESH_BED_LEVELING, AUTO_BED_LEVELING_BILINEAR, 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

define ENABLE_LEVELING_FADE_HEIGHT

// For Cartesian machines, instead of dividing moves on mesh boundaries, // split up moves into short segments like a Delta. This follows the // contours of the bed more closely than edge-to-edge straight moves.

define SEGMENT_LEVELED_MOVES

define LEVELED_SEGMENT_LENGTH 5.0 // (mm) Length of all segments (except the last one)

/**

• Enable the G26 Mesh Validation Pattern tool. */

  define G26_MESH_VALIDATION

  if ENABLED(G26_MESH_VALIDATION)

  define MESH_TEST_NOZZLE_SIZE 0.4 // (mm) Diameter of primary nozzle.

  define MESH_TEST_LAYER_HEIGHT 0.2 // (mm) Default layer height for the G26 Mesh Validation Tool.

  define MESH_TEST_HOTEND_TEMP 240 // (°C) Default nozzle temperature for the G26 Mesh Validation Tool.

  define MESH_TEST_BED_TEMP 60 // (°C) Default bed temperature for the G26 Mesh Validation Tool.

  define G26_XY_FEEDRATE 40 // (mm/s) Feedrate for XY Moves for the G26 Mesh Validation Tool.

  define G26_RETRACT_MULTIPLIER 1.0 // G26 Q (retraction) used by default between mesh test elements.

  endif

endif

if EITHER(AUTO_BED_LEVELING_LINEAR, AUTO_BED_LEVELING_BILINEAR)

// Set the number of grid points per dimension.

define GRID_MAX_POINTS_X 5

define GRID_MAX_POINTS_Y GRID_MAX_POINTS_X

// 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  //ACT
#if ENABLED(ABL_BILINEAR_SUBDIVISION) 
  // Number of subdivisions between probe points
  #define BILINEAR_SUBDIVISIONS 3
#endif

endif

If you've made any other modifications describe them in detail here.

Steps to Reproduce

1. enable AUTO_BED_LEVELING_BILINEAR
2. enable ABL_BILINEAR_SUBDIVISION
3. execute ABL
4. Move towards and over the 4th probeposition in x

[daleckystepan]

Try latest bugfix-2.0.x branch. Should be already fixed in #20122.

[ahmetcemturan]

https://github.com/ahmetcemturan/Marlin/tree/Sapphire-Pro_MKS-Nano-1.2-3.5inch-w-Probe
it is the latest...

[daleckystepan]

Unfortunately your version does not seem to be latest bugfix. It doesnt include fix https://github.com/MarlinFirmware/Marlin/pull/20143/files

[sjasonsmith]

Closing, since this issue has already been fixed in the bugfix-2.0.x branch. Please reply if you still have problems after updating to bugfix-2.0.x.

[github-actions[bot]]

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