horizontal_move_z can't be less than probe's z_offset

Guri Bee

3 min read

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01-10-2024

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When working with 3D printers, specifically those utilizing firmware like Marlin, you might encounter the error message: "horizontal_move_z can't be less than probe's z_offset." This warning often raises questions for both novice and experienced users regarding its implications and how to resolve it effectively. This article aims to clarify this error, provide practical examples, and suggest solutions to avoid it in the future.

What Does the Error Mean?

Definition of Terms

• horizontal_move_z: This term refers to the height at which the printer’s print head is expected to move horizontally across the X or Y axis. It’s the Z-axis height during a move operation.

• probe's z_offset: This value is the distance between the nozzle and the probe tip when the probe is at its defined "zero" point. It helps to calibrate the height offset so that the nozzle is positioned correctly relative to the bed.

Error Explanation

The error indicates that the height of a horizontal move (horizontal_move_z) is set to a value that is lower than the probe's z_offset. In simpler terms, when the printer tries to execute a move, it finds that the height is below the minimum required height dictated by the probe, which could lead to potential collisions with the print bed or incorrect probing sequences.

Causes of the Error

1. Incorrect Configuration: The most common cause of this error is an incorrect configuration in your printer's firmware. If the z_offset value is incorrectly set, it can lead to this issue.

2. Miscommunication Between Settings: Sometimes, the slicer software and firmware can have conflicting settings, leading to confusion over what horizontal_move_z should be.

3. Firmware Updates: Updates to firmware can sometimes reset configurations, making it crucial to check all parameters after a firmware update.

How to Resolve the Error

Step-by-Step Solutions

1. Check Your z_offset Setting

   • Navigate to the printer's firmware settings and verify the z_offset. This value should be calibrated correctly based on the actual distance between the nozzle and the probe.

   Example: If your z_offset is set to -1.0mm and your horizontal_move_z is set to -2.0mm, this will trigger the error. Adjust horizontal_move_z to be at least -1.0mm or higher.

2. Modify Slicing Settings

   • Review the slicing software settings to ensure that the horizontal_move_z parameters are set correctly in the G-code generation process.

   Example: Ensure that the slicer's default Z height settings for initial layer printing don’t inadvertently set a height that violates the probe's z_offset.

3. Calibration of Z-Axis

   • Run through the Z-axis calibration process to ensure all offsets and configurations are accurate. This can often resolve miscommunications between hardware and software.

4. Consult Firmware Documentation

   • Reference the documentation for your specific firmware (like Marlin) to find out if there are specific settings that may need adjustment based on your printer's model.

Additional Best Practices

• Regular Maintenance: Regularly inspect and calibrate your printer to avoid any errors due to physical wear and tear.

• Backup Configurations: Always back up your firmware configurations before making changes or updates to prevent data loss.

• Keep Firmware Updated: Keeping your firmware updated will not only fix bugs but also improve performance and compatibility with new features.

Conclusion

The error message "horizontal_move_z can't be less than probe's z_offset" serves as a crucial reminder to maintain proper configurations and calibrations within your 3D printer's settings. By understanding the terms involved, checking your settings diligently, and following best practices, you can prevent this error and ensure smooth operation of your 3D printing endeavors.

For further reading and official support, check the Marlin Documentation.

References

• Original discussions and inquiries about this error can often be found in community forums and GitHub discussions, where other users share their experiences and solutions. GitHub remains a vital resource for troubleshooting firmware-related issues. Always attribute information to the original authors in accordance with GitHub's community guidelines.

This guide is designed to be a comprehensive resource for understanding and resolving this common 3D printer issue. By employing the provided strategies and insights, you can enhance your 3D printing experience and minimize disruptions.