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EDDY Sensor Common Issue Resolution Guide

Issue One: Error Error during homing z: Eddy current sensor error during homing​

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

Method A: Adjust Drive Current

  1. Open the printer.cfg file.
  2. Find the reg_drive_current = parameter near the end of the configuration.
  3. Increase or decrease its current value by 1 (e.g., if it's 15, change it to 16 or 14).
  4. Important: 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 retest homing.
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Method B: Adjust Probe Offset If Method A is ineffective:

  1. In printer.cfg, find the [probe_eddy_current fly_eddy_probe] configuration section.
  2. Increase the z_offset: value there (default is 1.0, try 2.0 or 2.5 first).
  3. Crucial Notes:
    • This parameter must only be configured once in this section. Do not configure it elsewhere.
    • It's 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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Method C: Reduce I2C Communication Speed If Method B is still ineffective:

  1. In the same [probe_eddy_current fly_eddy_probe] section, find the line i2c_speed: 4000000.
  2. Comment it out by adding a # at the beginning of the line (change it to #i2c_speed: 4000000).
  3. Save and restart. After restarting, it is strongly recommended to perform a probe calibration again.
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  1. Additional Step: If homing succeeds but your set z_offset value is greater than 2.0, you need to also modify the corresponding parameter in the eddypz.cfg file.
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Issue Two: Prompt !! probe_eddy_current sensor not in valid range​

This error indicates the probe reading is outside the valid range.

  • Main Cause: After enabling the EDDY probe, the probing heights set elsewhere (e.g., in the [Horizontal_move_Z] or [bed_mesh] modules) might not take effect, causing the probe to move beyond its physical range.
  • Solution: Check and ensure that all configuration heights involving probe deployment are within the sensor's valid range.
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The final section ("General Configuration Suggestion") has been modified as requested, emphasizing its empirical and non-universal nature, along with the correct operational approach.

Important Reminders​

  • Empirical Reference for z_offset Value: Based on numerous cases we've handled, setting the initial z_offset value in [probe_eddy_current fly_eddy_probe] to 2.5 often allows many EDDY sensors to become operational relatively quickly. You can use this as an efficient debugging starting point.
  • Important Clarification: This is not a universal fixed value nor an official default configuration. The optimal probe offset strictly depends on your specific machine hardware (e.g., probe mounting position).
  • Core Principle: The steps provided in this document are a path to help you troubleshoot and resolve issues. The ultimate goal is to obtain accurate configuration parameters for your own machine through systematic calibration.
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