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Eddy Usage

info
  • Ensure your printer is not leaking electricity before use
  • If you previously configured eddy, Probe, or BL-Touch, please remove those configurations
  • When installing Eddy, the coil should be positioned above the nozzle, approximately 2mm-3mm away from it
  • Do not turn on the heated bed when testing
Notes
  • Machines with multiple Z axes need to be manually leveled once

Wiring Diagram​

  • Install with the logo facing the heated bed

Reference Configuration​

  • The XY offset values need to be calculated based on the scanning bed module and the nozzle itself, then modified in the offset values below.
  • The Z offset value must ensure the physical height difference between the probe coil and the nozzle tip is within the recommended range of 2~3mm.
[stepper_z]
endstop_pin: probe:z_virtual_endstop
# position_endstop: -0.5      
[probe_eddy_current fly_eddy_probe]
sensor_type: ldc1612
i2c_address: 43
i2c_mcu: SB2040
i2c_bus: i2c1b
x_offset: 0     # remember to set x offset
y_offset: 21.42 # remember to set y offset 
z_offset: 2     # remember to set z offset
i2c_speed: 4000000

[temperature_probe fly_eddy_probe]
sensor_type: Generic 3950
sensor_pin:SB2040:gpio28
horizontal_move_z: 2
  • Click the download link below
  • Loading...

Calculating XY Offset​

  • After downloading the model, calculate the XY offset based on your printer's actual setup
  • Modify the x_offset and y_offset values in the configuration after measurement

Eddy Calibration​

Precautions​

  • Ensure there is no configuration for Probe, BL-Touch, or related components
  • Machines with multiple Z axes need to be manually leveled once
  • Check that the heatbed is free of debris and the nozzle is clean before calibration

Adding Configuration​

Note

⚠️ Important Notes:

  1. The configuration below is temporary and must be deleted or commented out after use
  2. Click Save & Restart to save and restart after adding
  3. Must be added to the very top of the printer.cfg file, never at the bottom
[force_move]
enable_force_move: true

[gcode_macro _LDC_CALIBRATE_DRIVE_CURRENT]
gcode:
    BED_MESH_CLEAR
    SET_KINEMATIC_POSITION x=100 y=100 z=10
    G28 X Y
    M104 S0
    M140 S0
    M106 S0
    G0 X{printer.toolhead.axis_maximum.x / 2} Y{printer.toolhead.axis_maximum.y / 2} F6000
    G0 Z30 F600
    G4 P1000
    LDC_CALIBRATE_DRIVE_CURRENT CHIP=fly_eddy_probe 
    G4 P1000
    SAVE_CONFIG

[gcode_macro PROBE_EDDY_CURRENT_CALIBRATE_AUTO]
gcode:
    BED_MESH_CLEAR
    G28 X Y
    M104 S0
    M140 S0
    M106 S0
    G90 # Abs positioning
    G1 X{ printer.toolhead.axis_maximum.x/2 } Y{ printer.toolhead.axis_maximum.y/2 } F6000
    {% if 'z' not in printer.toolhead.homed_axes %}
        SET_KINEMATIC_POSITION Z={ printer.toolhead.axis_maximum.z-1 } # Allows the user to work it down until it touches.
    {% endif %}
    PROBE_EDDY_CURRENT_CALIBRATE {rawparams}

[gcode_macro TEMP_COMPENSATION]
description: Temperature compensation calibration process
gcode:
    {% set bed_temp = params.BED_TEMP|default(90)|int %}
    {% set nozzle_temp = params.NOZZLE_TEMP|default(250)|int %}
    {% set temperature_range_value = params.TEMPERATURE_RANGE_VALUE|default(3)|int %}
    {% set desired_temperature = params.DESIRED_TEMPERATURE|default(80)|int %}
    {% set Temperature_Timeout_Duration = params.TEMPERATURE_TIMEOUT_DURATION|default(6500000000)|int %}
        # Safety check: Ensure all axes are not locked
        {% if printer.pause_resume.is_paused %}
            { action_raise_error("Error: Printer is paused, please resume first") }
        {% endif %}
        # Step 1: Home all axes
        STATUS_MESSAGE="Homing all axes..."
        G28
        STATUS_MESSAGE="Homing complete"
        # Step 2: Automatic leveling
        #Z_TILT_ADJUST
        #quad_gantry_level
        # Step 3: Safe Z-axis lift
        STATUS_MESSAGE="Lifting Z-axis..."
        G90
        G0 Z5 F2000  # Lift slowly to prevent collisions
        # Step 4: Set timeout and temperature calibration
        SET_IDLE_TIMEOUT TIMEOUT={Temperature_Timeout_Duration}
        STATUS_MESSAGE="Starting temperature probe calibration..."
        TEMPERATURE_PROBE_CALIBRATE PROBE=fly_eddy_probe TARGET={desired_temperature} STEP={temperature_range_value}
        # Step 5: Set printing temperatures (modify as needed)
        STATUS_MESSAGE="Setting working temperatures..."
        SET_HEATER_TEMPERATURE HEATER=heater_bed TARGET={bed_temp}
        SET_HEATER_TEMPERATURE HEATER=extruder TARGET={nozzle_temp}
        # Completion message
        STATUS_MESSAGE="Temperature compensation process completed!"
        # description: G-Code macro

Drive Current Calibration​

  • Enter the following command in the web console: 
    _LDC_CALIBRATE_DRIVE_CURRENT
  • The printer will move to the center position and move the print head away from the heatbed
  • It will then start automatic drive current calibration and save the result upon completion
  • Finally, Klipper will restart

Calibrating Height​

tip
  • Machines with multiple Z axes need to be manually leveled once before calibrating height
  • After calibrating height on multi-Z axis machines, perform a leveling operation and recalibrate height (recommended)
  • Check that the heatbed is free of debris and the nozzle is clean before calibration

  • Enter the following command in the web console:

    PROBE_EDDY_CURRENT_CALIBRATE_AUTO CHIP=fly_eddy_probe

  • The printer will move to the center position and display a dialog box

  • The Z height shown by Klipper after executing this command is not important; you only need to adjust the nozzle to the correct height

  • Follow the prompts in the Klipper UI to gradually lower the nozzle until it touches a sheet of paper placed on the print bed. Ensure the paper can slide smoothly under slight resistance.

  • Be careful not to apply excessive pressure to avoid damaging the print bed.

  • After completing the adjustment, click the ACCEPT button in the dialog box. The system will begin calibrating the EDDY height

  • Once calibration is complete, click the SAVE_CONFIG & Restart button in the top-right corner of the web interface to save the configuration and restart Klipper

Temperature Compensation​

tip
  • When Eddy performs temperature compensation, the heatbed reaches very high temperatures—avoid burns
  • Do not preheat the heatbed or nozzle before starting temperature compensation
  • Do not touch the heatbed surface during the process
  • It is recommended to wear heat-resistant gloves
  • Click the TEMP_COMPENSATION macro button, which will open a dialog box
  • In the dialog box, you can set the heatbed temperature, nozzle temperature, temperature range value, and target temperature
  • Click the START button to begin temperature compensation calibration
  • During the calibration process, the system will automatically adjust the heatbed and nozzle temperatures and prompt you to manually perform Z offset calibration every 3℃
  1. After this operation, the UI will display a Z-axis adjustment box. Use the manual Z-axis offset calibration (Paper Test) method described above. Insert a piece of paper between the nozzle and the bed, then confirm the value.
  1. After accepting the value, the system will automatically set the heatbed temperature to 80℃ and the nozzle temperature to 250℃.
  2. If you're in a room with air conditioning or open windows, it's recommended to turn off the AC or close the window to ensure Eddy's temperature rises properly, as wind can interfere with heating.
  3. As Eddy's temperature increases, the system will automatically prompt you to perform manual Z offset calibration every 3℃. The heatbed temperature is very high—avoid burns!!!
  1. Repeat the manual Z offset calibration (Paper Test) until calibration is complete. If you notice that Eddy’s temperature stops rising, you can use the relevant commands below to end the calibration early.
  • Additional G-code commands available during drift calibration include: TEMPERATURE_PROBE_NEXT
  • TEMPERATURE_PROBE_NEXT Forces Eddy to sample new data before reaching the target temperature of 80℃.
  • TEMPERATURE_PROBE_COMPLETE Ends calibration before Eddy reaches the set temperature of 80℃.
  • ABORT Terminates the calibration and discards the results.
  • After calibration completes, use SAVE_CONFIG to save the temperature offset settings!
  • In summary, the calibration process described above is more challenging and time-consuming compared to most other procedures. It may require practice and multiple attempts to achieve excellent first-layer print results across a wide temperature range!

Optimization​

Quick Bed Sweeping​

  • The macro below will first raise the nozzle to 10mm before performing bed leveling, then quickly sweep the bed. After the sweeping is completed, the nozzle will be raised to 2mm for fine leveling.
[gcode_macro Z_TILT_ADJUST]
rename_existing: _Z_TILT_ADJUST
gcode:
    {% set PROBE_Z_OFFSET = printer.configfile.settings['probe_eddy_current fly_eddy_probe'].z_offset|float %}
    # ========== State Save ==========
    SAVE_GCODE_STATE NAME=STATE_Z_TILT
    
    # ========== Environment Preparation ==========
    BED_MESH_CLEAR                       # Clear existing bed mesh data 
    
    # ========== Main Leveling Process ==========
    {% if not printer.z_tilt.applied %}
        # Initial coarse adjustment 
        _Z_TILT_ADJUST horizontal_move_z=10 retry_tolerance=1
    {% endif %}
    
    # Fine secondary leveling 
    _Z_TILT_ADJUST horizontal_move_z={PROBE_Z_OFFSET} retry_tolerance=0.075 retries=20 METHOD=rapid_scan ADAPTIVE=1
        G0 Z10 F6000                     # Use standard G-code commands instead of HORIZONTAL_MOVE_Z

    # ========== Post-Processing ==========
    G90                                 # Force absolute coordinate mode 
    G0 Z10 F6000                        # Raise Z axis to safe height 
    M117 Z_tilt Completed               # Display completion status 
    #G28                                 # Return to origin
    # ========== State Restore ==========
    RESTORE_GCODE_STATE NAME=STATE_Z_TILT
    M400

Heated Bed​

  • The macro below will enable the bed mesh to operate in fast mode.
  • This configuration reduces the influence of heated bed heating on bed leveling.
  • This configuration also reduces the impact of high-power heated beds on EDDY.
  • The heated bed will be turned off during bed mesh calibration and restored to its original temperature afterward.
[gcode_macro BED_MESH_CALIBRATE]
rename_existing: _BED_MESH_CALIBRATE
gcode:
    {% set PROBE_Z_OFFSET = printer.configfile.settings['probe_eddy_current fly_eddy_probe'].z_offset|float %}
    {% set TARGET_TEMP = printer.heater_bed.target %}
    M140 S0
    _BED_MESH_CALIBRATE horizontal_move_z={PROBE_Z_OFFSET} METHOD=rapid_scan {rawparams}
    M140 S{TARGET_TEMP}

Using the Z-offset Function with EDDY​

Download EDDY Optimized Configuration​

  • Click on the download link below
  • Please note there are two files, eddy.cfg and variables.cfg, which need to be placed in the same directory as printer.cfg
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Add eddy.cfg Configuration​

  • If you want Eddy to act as both an auto-leveling sensor and a Z-axis endstop, and you want to use the Z-axis offset function
  • Please add the following configuration at the top of your printer.cfg
[include eddy.cfg]

Modify Path​

  • Open the eddy.cfg file and locate the [save_variables] configuration section
  • Modify the filename path to match your system's path
Notes
  • Below are examples
  • You need to adjust the path of the variables.cfg file according to your system
  • Path used by Fly_FAST system 
    [save_variables]
    filename: /usr/share/printer_data/config/variables.cfg
  • Path used by Fly_Armbian system; other systems can refer to this method 
    [save_variables]
    filename: /home/fly/printer_data/config/variables.cfg

Z-Offset Instructions​

  • To calibrate the Z-offset, print a large model, and only one layer is required
  • Z-offset calibration location in mainsail
  • Z-offset calibration location in fluidd
  • After calibration, click Save. Please note that the save confirmation will only be shown in the console!!!!
  • No need to restart klipper after saving!
Notes
  • Repeat the Z-offset calibration several times
  • To achieve a perfect first layer
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