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Diffstat (limited to 'docs/Bed_Mesh.md')
| -rw-r--r-- | docs/Bed_Mesh.md | 67 |
1 files changed, 47 insertions, 20 deletions
diff --git a/docs/Bed_Mesh.md b/docs/Bed_Mesh.md index c45ca2ab..e759f961 100644 --- a/docs/Bed_Mesh.md +++ b/docs/Bed_Mesh.md @@ -261,13 +261,18 @@ fade_target: 0 mesh is used, however it may be desirable to manually adjust the fade target if one wants to print on a specific portion of the bed. -### The Relative Reference Index +### Configuring the zero reference position -Most probes are susceptible to drift, ie: inaccuracies in probing introduced by -heat or interference. This can make calculating the probe's z-offset -challenging, particularly at different bed temperatures. As such, some printers -use an endstop for homing the Z axis, and a probe for calibrating the mesh. -These printers can benefit from configuring the relative reference index. +Many probes are susceptible to "drift", ie: inaccuracies in probing introduced +by heat or interference. This can make calculating the probe's z-offset +challenging, particularly at different bed temperatures. As such, some +printers use an endstop for homing the Z axis and a probe for calibrating the +mesh. In this configuration it is possible offset the mesh so that the (X, Y) +`reference position` applies zero adjustment. The `reference postion` should +be the location on the bed where a +[Z_ENDSTOP_CALIBRATE](./Manual_Level#calibrating-a-z-endstop) +paper test is performed. The bed_mesh module provides the +`zero_reference_position` option for specifying this coordinate: ``` [bed_mesh] @@ -275,23 +280,45 @@ speed: 120 horizontal_move_z: 5 mesh_min: 35, 6 mesh_max: 240, 198 +zero_reference_position: 125, 110 probe_count: 5, 3 -relative_reference_index: 7 ``` - -- `relative_reference_index: 7`\ +- `zero_reference_position: `\ _Default Value: None (disabled)_\ - When the probed points are generated they are each assigned an index. You - can look up this index in klippy.log or by using BED_MESH_OUTPUT (see the - section on Bed Mesh GCodes below for more information). If you assign an - index to the `relative_reference_index` option, the value probed at this - coordinate will replace the probe's z_offset. This effectively makes - this coordinate the "zero" reference for the mesh. + The `zero_reference_position` expects an (X, Y) coordinate matching that + of the `reference position` described above. If the coordinate lies within + the mesh then the mesh will be offset so the reference position applies zero + adjustment. If the coordinate lies outside of the mesh then the coordinate + will be probed after calibration, with the resulting z-value used as the + z-offset. Note that this coordinate must NOT be in a location specified as + a `faulty_region` if a probe is necessary. + +#### The deprecated relative_reference_index + +Existing configurations using the `relative_reference_index` option must be +updated to use the `zero_reference_position`. The response to the +[BED_MESH_OUTPUT PGP=1](#output) gcode command will include the (X, Y) +coordinate associated with the index; this position may be used as the value for +the `zero_reference_position`. The output will look similar to the following: + +``` +// bed_mesh: generated points +// Index | Tool Adjusted | Probe +// 0 | (1.0, 1.0) | (24.0, 6.0) +// 1 | (36.7, 1.0) | (59.7, 6.0) +// 2 | (72.3, 1.0) | (95.3, 6.0) +// 3 | (108.0, 1.0) | (131.0, 6.0) +... (additional generated points) +// bed_mesh: relative_reference_index 24 is (131.5, 108.0) +``` + +_Note: The above output is also printed in `klippy.log` during initialization._ + +Using the example above we see that the `relative_reference_index` is +printed along with its coordinate. Thus the `zero_reference_position` +is `131.5, 108`. + -When using the relative reference index, you should choose the index nearest -to the spot on the bed where Z endstop calibration was done. Note that -when looking up the index using the log or BED_MESH_OUTPUT, you should use -the coordinates listed under the "Probe" header to find the correct index. ### Faulty Regions @@ -371,12 +398,12 @@ following parameters are available: - `MESH_ORIGIN` - `ROUND_PROBE_COUNT` - All beds: - - `RELATIVE_REFERENCE_INDEX` - `ALGORITHM` See the configuration documentation above for details on how each parameter applies to the mesh. + ### Profiles `BED_MESH_PROFILE SAVE=<name> LOAD=<name> REMOVE=<name>` |