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eddy

EDDY Sensor Common Issue Resolution Guide

Issue 1: Error Error during homing z: Eddy current sensor error during Homing​

If you encounter this error, please try the following methods in order:

Method 1: Update Klipper

Important Notice

There was a compatibility issue with the Z homing function of EDDY, which has been optimized in the Klipper update on January 6, 2026. Please proceed as follows based on your host computer type:

  • If using a standard host computer, update Klipper to the latest version.
  • If using a FLY host computer, upgrade the system version to V1.3.5 or higher. Note: After completing the above update, the EDDY needs to be recalibrated.

Method 2: Adjust Drive Current

  1. Open the printer.cfg file.
  2. Locate the reg_drive_current = parameter at the bottom of the configuration.
  3. Increase or decrease its current value by 1 (e.g., if it is 15, change it to 16 or 14).
  4. Note: Please enter the calculated result directly (e.g., 16), do not enter an expression (e.g., 15+1).
  5. Save the file and restart the printer, then re-test homing.
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Method 3: Adjust Probe Offset If Method 1 is ineffective:

  1. Find the [probe_eddy_current fly_eddy_probe] configuration section in printer.cfg.
  2. Increase the z_offset: value (default is 1.0, try 2.0 or 2.5 first).
  3. Important Notes:
    • This parameter can only be configured once in this location. Do not configure it repeatedly.
    • It is recommended not to exceed 3.0; the specific value depends on your machine's hardware.
  4. Save and restart the printer, then test.
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Issue 2: Prompt !! probe_eddy_current sensor not in valid range​

This error indicates that the probe reading is out of the valid range.

  • Main Cause: After enabling the EDDY probe, the probing height set in other locations (e.g., [Horizontal_move_Z] or [bed_mesh] modules) may not take effect, causing the probe to move beyond its physical range.
  • Solution: Check and ensure all configuration heights involving probe descent are within the sensor's valid range.
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Important Reminders​

  • Empirical Reference for z_offset Value: In a large number of cases we have handled, setting the initial z_offset value in [probe_eddy_current fly_eddy_probe] to 2.5 often allows many EDDY sensors to enter a working state relatively quickly. You can use this as an efficient debugging starting point.
  • Important Note: This is not a universal fixed value, nor is it an official default configuration. The optimal offset for the probe strictly depends on your specific machine hardware (e.g., probe installation position).
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