[FR] Manual probe. Use saved z value

[cfytrok]

Describe the feature you want

There is an option MANUAL_PROBE_START_Z. Comment out to use the last-measured height. How about using previously saved mesh poins as start Z? So it will be easy to verify and edit mesh.

[borland1]

Not sure what your saying would make it easier? Are you referring to this code snippet in Configuration.h ?

1910  #if ANY(MESH_BED_LEVELING, AUTO_BED_LEVELING_UBL, PROBE_MANUALLY)
1911   // Set a height for the start of manual adjustment
1912  #define MANUAL_PROBE_START_Z 0.2  // (mm) Comment out to use the last-measured height
1913  #endif

The default is to start manual bed leveling grid Z height at 0.2mm above the Home Z position's height (typically at (0,0,0) ). If you "comment out" line 1912, what are the affects, i.e., what exactly is the "last-measured height"? It's not clear to me what happens.

After running the Probe Manually to level the bed, are you using the Edit Mesh menu feature along with a single layer grid test print? I have found that 3D printing the test grid and then editing the mesh grid, to be the most accurate way to dial in the mesh.

[cfytrok]

Yes, I reffering to this this. code.https://github.com/MarlinFirmware/Marlin/blob/e1df912dc7f05858c727d4e0994082b78ae1998f/Marlin/Configuration.h#L1911-L1914 Now there are 2 options: 1) use MANUAL_PROBE_START_Z height as start Z position for everty grid point. (default) 2) use Z-height = 0.4 for first point and Z-height = Z-height of previous point as start Z for next point (comment out 1912 line). I suggest adding a new option: 3) Load mesh from memory and use mesh Z value ​​as start Z height individualy for every point.

Edit Mesh menu only allows you to replace the value in memory. It does not allow you to check how far the nozzle is from the table after updating the value.