Klipper bed mesh on print area only macro install guide

readme.md

READ THIS FIRST

Adaptive bed mesh is merged into klipper master branch. You can use this feature without this custom macro. Official klipper adaptive bed mesh

Klipper mesh on print area only install guide

What this macro do

• This macro will dynamically changing the bed mesh area based on the size of the parts will be printed. The fw will only probe on the area that the part will be printed (plus mesh_area_offset value)

Setup guide

• (1) Add the following macro to your printer config, this will replace the default BED_MESH_CALIBRATE command.

[gcode_macro BED_MESH_CALIBRATE]
rename_existing: BED_MESH_CALIBRATE_BASE
; gcode parameters
variable_parameter_AREA_START : 0,0
variable_parameter_AREA_END : 0,0
; the clearance between print area and probe area 
variable_mesh_area_offset : 5.0
; number of sample per probe point
variable_probe_samples : 2
; minimum probe count
variable_min_probe_count : 4
; scale up the probe count, should be 1.0 ~ < variable_max_probe_count/variable_min_probe_count
variable_probe_count_scale_factor : 1.0
; enable preference index
variable_enable_reference_index : False
gcode:
    {% if params.AREA_START and params.AREA_END %}
        {% set bedMeshConfig = printer["configfile"].config["bed_mesh"] %}
        {% set safe_min_x = bedMeshConfig.mesh_min.split(",")[0]|float %}
        {% set safe_min_y = bedMeshConfig.mesh_min.split(",")[1]|float %}
        {% set safe_max_x = bedMeshConfig.mesh_max.split(",")[0]|float %}
        {% set safe_max_y = bedMeshConfig.mesh_max.split(",")[1]|float %}

        {% set area_min_x = params.AREA_START.split(",")[0]|float %}
	{% set area_min_y = params.AREA_START.split(",")[1]|float %}
	{% set area_max_x = params.AREA_END.split(",")[0]|float %}
	{% set area_max_y = params.AREA_END.split(",")[1]|float %}

	{% if bedMeshConfig.probe_count.split(",")|length == 2 %}
            {% set meshPointX = bedMeshConfig.probe_count.split(",")[0]|int %}
            {% set meshPointY = bedMeshConfig.probe_count.split(",")[1]|int %}
        {% else %}
            {% set meshPointX = bedMeshConfig.probe_count.split(",")[0]|int %}
            {% set meshPointY = bedMeshConfig.probe_count.split(",")[0]|int %}
        {% endif %}

	{% set meshMaxPointX = meshPointX %}
	{% set meshMaxPointY = meshPointY %}


        {% if (area_min_x < area_max_x) and (area_min_y < area_max_y) %}
            {% if area_min_x - mesh_area_offset >=  safe_min_x %}
                {% set area_min_x = area_min_x - mesh_area_offset %}
            {% else %}
                {% set area_min_x = safe_min_x %}
            {% endif %}

            {% if area_min_y - mesh_area_offset >=  safe_min_y %}
                {% set area_min_y = area_min_y - mesh_area_offset %}
            {% else %}
                {% set area_min_y = safe_min_y %}
            {% endif %}

            {% if area_max_x + mesh_area_offset <=  safe_max_x %}
                {% set area_max_x = area_max_x + mesh_area_offset %}
            {% else %}
                {% set area_max_x = safe_max_x %}
            {% endif %}

            {% if area_max_y + mesh_area_offset <=  safe_max_y %}
                {% set area_max_y = area_max_y + mesh_area_offset %}
            {% else %}
                {% set area_max_y = safe_max_y %}
            {% endif %}

            {% set meshPointX = (meshPointX * (area_max_x - area_min_x) / (safe_max_x - safe_min_x) * probe_count_scale_factor)|round(0)|int %}
            {% if meshPointX < min_probe_count %}
                {% set meshPointX = min_probe_count %}
            {% endif %}
	    {% if meshPointX > meshMaxPointX %}
                {% set meshPointX = meshMaxPointX %}
            {% endif %}

            {% set meshPointY = (meshPointY * (area_max_y -area_min_y ) / (safe_max_y - safe_min_y) * probe_count_scale_factor )|round(0)|int %}
            {% if meshPointY < min_probe_count %}
                {% set meshPointY = min_probe_count %}
            {% endif %}
	    {% if meshPointY > meshMaxPointY %}
                {% set meshPointY = meshMaxPointY %}
            {% endif %}

            {% set algorithm = "bicubic" %}
	    {% if "algorithm" in bedMeshConfig %}
	        {% set algorithm = bedMeshConfig.algorithm %}
            {% endif %}
            {% if meshPointX >=7 or meshPointY >=7 %}
                {% set algorithm = "bicubic" %}
            {% endif %}

            {% if enable_reference_index %}
                {% set referenceIndex = (meshPointX * meshPointY / 2 - 1 )|round(0)|int %}
                BED_MESH_CALIBRATE_BASE mesh_min={area_min_x},{area_min_y} mesh_max={area_max_x},{area_max_y} probe_count={meshPointX},{meshPointY} samples={probe_samples|int} algorithm={algorithm} relative_reference_index={referenceIndex}
            {% else %}
                BED_MESH_CALIBRATE_BASE mesh_min={area_min_x},{area_min_y} mesh_max={area_max_x},{area_max_y} probe_count={meshPointX},{meshPointY} samples={probe_samples|int} algorithm={algorithm}
            {% endif %}
        {% else %}
            BED_MESH_CALIBRATE_BASE
        {% endif %}
    {% else %}
        BED_MESH_CALIBRATE_BASE
    {% endif %}

• (2) Go to slicer setting and replace the old bed mesh gcode the following command.

Prusa Slicer
BED_MESH_CALIBRATE AREA_START={first_layer_print_min[0]},{first_layer_print_min[1]} AREA_END={first_layer_print_max[0]},{first_layer_print_max[1]}

Ideal maker
BED_MESH_CALIBRATE AREA_START={print_pos_min_x},{print_pos_min_y} AREA_END={print_pos_max_x},{print_pos_max_y}

Cura slicer
BED_MESH_CALIBRATE AREA_START=%MINX%,%MINY% AREA_END=%MAXX%,%MAXY%

*(Cura slicer plugin) To make the macro to work in Cura slicer, you need to install the post process plugin click here to download (based on frankbags's script)
- In cura menu Help -> Show configuration folder.
- Copy the python script from the above link in to scripts folder.
- Restart Cura
- In cura menu Extensions -> Post processing -> Modify G-Code and select Klipper print area mesh

For user using single command START_PRINT

• (*) If you use single command start gcode like START_PRINT BED_TEMP={material_bed_temperature_layer_0} EXTRUDER_TEMP={material_print_temperature_layer_0} .You might need to add parameter parsing to BED_MESH_CALIBRATE inside START_PRINT. This is an example, also check my macro sample

[gcode_macro START_PRINT]
variable_parameter_EXTRUDER_TEMP: 190
variable_parameter_BED_TEMP: 60
; gcode parameters for area bed mesh
variable_parameter_AREA_START : 0,0
variable_parameter_AREA_END : 0,0
gcode:
    # preheat, homing, etc
    BED_MESH_CALIBRATE AREA_START={params.AREA_START|default("0,0")} AREA_END={params.AREA_END|default("0,0")}
    # the rest of your start macro here

And you will need to change Slicer start gcode to this

• Cura: START_PRINT EXTRUDER_TEMP={material_print_temperature_layer_0} BED_TEMP={material_bed_temperature_layer_0} AREA_START=%MINX%,%MINY% AREA_END=%MAXX%,%MAXY%
• Prusa slicer: START_PRINT EXTRUDER_TEMP=[first_layer_temperature] BED_TEMP=[first_layer_bed_temperature] AREA_START={first_layer_print_min[0]},{first_layer_print_min[1]} AREA_END={first_layer_print_max[0]},{first_layer_print_max[1]}

change logs

• 2022/07/21
  • Added force lagrange algorithm for mesh with lower than 3 points
  • Added enable_reference_index config flag

The code does not work?

• I will try to help if possible, you will have to post ALL of your configs, your slicer start gcode and your sliced gcode.
• If I'm cannot or too slow to respose, our discord members might help you. Check our discord here

Hi, thank you for your amazing work!!!
Works perfectly for mine with cura, but it probes the wrong area, it doesn't use the bltouch y_offset parameter so it probes the area "in front" of the print area.

Thank you in advance for your help

############ printer.cfg ###############
[bltouch] # enable for BLTouch
control_pin: PA8
sensor_pin: ^PA11
#control_pin: PA4
#sensor_pin: ^PC4
#pin_up_touch_mode_reports_triggered: False
Probe_with_touch_mode: True
stow_on_each_sample: False
y_offset: 27.5
samples: 3
samples_result: median
sample_retract_dist: 5.0
samples_tolerance: 0.01
samples_tolerance_retries: 3

[safe_z_home]
home_xy_position: 112, 157 # Change coordinates to the center of your print bed
speed: 50
z_hop: 10 # Move up 10mm
z_hop_speed: 5

[bed_mesh]
speed: 120
horizontal_move_z: 5
mesh_min: 12, 80
mesh_max: 212, 225
probe_count: 5, 5
mesh_pps: 2, 3
algorithm: bicubic
bicubic_tension: 0.2

######### Cura start gcode ##########
G21 ; metric values
G90 ; absolute positioning
M82 ; set extruder to absolute mode
M107 ; start with the fan off
G92 E0 ; Reset Extruder
M104 S140 ; extruder pretemp
M190 S{material_bed_temperature_layer_0} ; wait for bed temp
G28 ; Home all axes
BED_MESH_CALIBRATE AREA_START=%MINX%,%MINY% AREA_END=%MAXX%,%MAXY%
G1 Z1 F3000 ;
G1 X1 Y20 F3000 ;
G1 Z0.4 F300 ; Move Z Axis DOWN little
M109 S{material_print_temperature_layer_0} ; wait for extruder temp
G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed
G1 X0.1 Y25 Z0.3 F5000.0 ; Move to start position
G1 X0.1 Y200.0 Z0.3 F1500.0 E15 ; Draw the first line
G1 X0.4 Y200.0 Z0.3 F5000.0 ; Move to side a little
G1 X0.4 Y25 Z0.3 F1500.0 E30 ; Draw the second line
G92 E0 ; Reset Extruder
G1 Z2.0 F3000 ; Move Z Axis up little to prevent scratching of Heat Bed
G1 X5 Y25 Z0.3 F5000.0 ; Move over to prevent blob squish

I am using a single line Gcode in Orca slicer and a macro in my klipper, I can't seem to get it to work with ORCA Slicer, What would be the start and end Gcode in Orca slicer in order to make it parse the correct data and act upon it.

This is my current Machine Code in Orca slicer:

START_PRINT EXTRUDER_TEMP=[nozzle_temperature_initial_layer] BED_TEMP=[bed_temperature_initial_layer]

This is my klipper START_PRINT macro:

[gcode_macro START_PRINT]
variable_parameter_EXTRUDER_TEMP: 220
variable_parameter_BED_TEMP: 65
variable_parameter_AREA_START : 0,0
variable_parameter_AREA_END : 0,0
gcode:
  {% set BED_TEMP = params.BED_TEMP|default(60)|float %}
  {% set EXTRUDER_TEMP = params.EXTRUDER_TEMP|default(200)|float %}
  M190 S{BED_TEMP}
  ;Set and wait for nozzle to reach temperature
  M109 S{EXTRUDER_TEMP}
  G28
  ;Enable the below line to allow auto bed mesh generation for the object being printed.
  BED_MESH_CALIBRATE AREA_START={params.AREA_START|default("0,0")} AREA_END={params.AREA_END|default("0,0")}
  G92 E0 #Reset Extruder
  G1 Z2.0 F300 #Move Z Axis up
  G1 X10.1 Y20 Z0.28 F5000.0 #Move to start position
  G1 X10.1 Y200.0 Z0.28 F1500.0 E15 #Draw the first line
  G1 X10.4 Y200.0 Z0.28 F5000.0 #Move to side a little
  G1 X10.4 Y20 Z0.28 F1500.0 E30 #Draw the second line
  G92 E0 #Reset Extruder
  G1 Z2.0 F3000 #Move Z Axis up

@ChipCE do you have some advice on getting this working with the Orca Slicer? I believe it has something to do with the START G-code. This is how mine look like:
START_PRINT EXTRUDER_TEMP=[nozzle_temperature_initial_layer]
BED_TEMP=[bed_temperature_initial_layer_single] MATERIAL=[filament_type]
AREA_START=%MINX%,%MINY% AREA_END=%MAXX%,%MAXY%

@ChipCE do you have some advice on getting this working with the Orca Slicer? I believe it has something to do with the START G-code. This is how mine look like: START_PRINT EXTRUDER_TEMP=[nozzle_temperature_initial_layer] BED_TEMP=[bed_temperature_initial_layer_single] MATERIAL=[filament_type] AREA_START=%MINX%,%MINY% AREA_END=%MAXX%,%MAXY%

This is the wrong start g-code for PrusaSlicer flavors. You are using the Cura one.

@frankbags thanks for the help! It worked!

Hello @ChipCE!

I saw on the KLIPPER Configuration Changes (20230619) that RELATIVE_REFERENCE_INDEX is no longer available as a parameter for the BED_MESH_CALIBRATE gcode command.

Would you please update the Klipper bed mesh on print area only macro readme.md sample code to reflect this deprecation?

For Cura users version 5.7 on Windows, To make the slicer work with the plugin I made it work by putting the file in:
C:\Program Files\UltiMaker Cura 5.7.0\share\cura\plugins\PostProcessingPlugin\scripts.

To put it there you need to be the admin of your PC.
The file must have the same name as the class. (KlipperPrintArea.py)

Finally, select the plugin from Extension->Post Processing->Modify G-Code.

The file I'm referring to is the one reported at the point:
#(Cura slicer plugin) To make the macro to work in Cura slicer, you need to install the post process plugin click here to download (based on frankbags's script)

Hi, got this issue: !! {"code":"key112", "msg": "Move exceeds maximum extrusion (0.709mm^2 vs 0.640mm^2)
See the 'max_extrude_cross_section' config option for details", "values": [0.709, 0.640]} can you helpme ?