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No retroactive changes with M851 Z

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If using babystep to adjust the Z probe offset, the axis will move and the mesh will be updated at the same time, causing a doubling of the Z offset over the rest of the print.

To correct for this, the current Z position would need to be modified in the opposite direction, canceling out the additional Z offset added to the mesh. This would be confusing to users, and moreover it would not be accurate without also taking the current Z fade level and current Z height into account.

It might make sense to change the mesh in the case where no babystepping is taking place, but this could be considered an undesirable side-effect of changing the `zprobe_zoffset`.

One way to remedy this would be to return to storing the mesh with `zprobe_zoffset` included, then subtracting `zprobe_zoffset` from the returned Z value. Thus, a babystep moving the Z axis up 1mm would subtract 1 from `zprobe_zoffset` while adding 1 to all mesh Z values.

Without including the `zprobe_zoffset` in the `z_values` there is no safe way to alter the mesh in conjunction with babystepping, although it's fine without it.
This commit is contained in:
Scott Lahteine
2017-11-16 16:53:55 -06:00
parent 7dacc999b9
commit 3bba7d60f3
6 changed files with 8 additions and 63 deletions
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7
Marlin/src/module/configuration_store.cpp
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@@ -247,10 +247,6 @@ void MarlinSettings::postprocess() {
set_z_fade_height(new_z_fade_height);
#endif
#if HAS_BED_PROBE
refresh_zprobe_zoffset();
#endif
#if ENABLED(AUTO_BED_LEVELING_BILINEAR)
refresh_bed_level();
//set_bed_leveling_enabled(leveling_is_on);
@@ -355,9 +351,8 @@ void MarlinSettings::postprocess() {
sizeof(mbl.z_values) == GRID_MAX_POINTS * sizeof(mbl.z_values[0][0]),
"MBL Z array is the wrong size."
);
const bool leveling_is_on = mbl.has_mesh;
const uint8_t mesh_num_x = GRID_MAX_POINTS_X, mesh_num_y = GRID_MAX_POINTS_Y;
EEPROM_WRITE(leveling_is_on);
EEPROM_WRITE(mbl.has_mesh);
EEPROM_WRITE(mbl.z_offset);
EEPROM_WRITE(mesh_num_x);
EEPROM_WRITE(mesh_num_y);