July 20, 2025

Why Does My Printer Auto Home and Ignore Z Offset?

Introduction

If you own a 3D printer like the Ender 3, Ender 3 V3 SE, or Kobra 3, chances are you’ve encountered Z offset issues. One of the most frustrating problems is when your printer auto homes but ignores the Z offset. This can lead to failed prints, nozzle crashes, or printing in mid-air. This article covers the major causes, how to fix them, and specific model issues — especially for the Ender 3 series and Kobra printers.

Why Does My Printer Auto Home and Ignore Z Offset Ender?

The Z offset determines the precise distance between the nozzle and the print bed. When your printer auto homes, it’s supposed to use this value to start the print at the correct height. But in many cases, the Ender 3 auto homes correctly but starts the print ignoring the Z offset — usually printing too high or crashing into the bed.

Common reasons:

Z offset not saved properly in EEPROM.
Firmware not configured to use saved Z offset.
Bed leveling data not enabled during print.
Faulty or inconsistent firmware updates.
Start G-code missing necessary commands.

Ender 3 Not Saving Z Offset

One of the most reported issues is Ender 3 not saving Z offset even after you set it manually. This is usually because the settings were changed but not saved to EEPROM.

Fixes:

After setting Z offset, go to your printer’s menu and select “Store Settings” or use the terminal command M500 to save to EEPROM.
Ensure you’re not restarting or powering off before saving.
If using OctoPrint or Cura, check that the G-code doesn’t override the Z offset.

3D Printer Z-Offset Problem

Z-offset problems are not unique to the Ender 3. Nearly every 3D printer uses Z offset to fine-tune the first layer. If the offset is off by even 0.1mm, your print will fail.

Common problems:

Nozzle too far from the bed: leads to poor adhesion or spaghetti prints.
Nozzle too close to the bed: causes grinding, clogging, or scratched beds.
Incorrect Z-offset calibration procedure.

Best practices:

Always calibrate Z offset after bed leveling.
Perform it with the bed and nozzle preheated.
Use a piece of paper or feeler gauge under the nozzle to find the correct position.

How to Calibrate Z Offset Ender 3 V3 SE

The Ender 3 V3 SE has automatic bed leveling, but you still need to set the Z offset manually.

Steps:

Go to the Control Menu > Motion > Z Offset.
Lower the nozzle slowly until it lightly grabs a piece of paper.
Once you’re happy, press to confirm.
Don’t forget to Store Settings (M500).
Run a test print and adjust slightly if needed during the first layer.

Ender 3 V3 SE Stuck on Auto Z Offset

Some users report the Ender 3 V3 SE gets stuck on the Auto Z Offset calibration or fails to move after homing.

Causes:

Firmware bug.
Sensor malfunction.
Not enough clearance to detect the bed.

Solution:

Update to the latest Creality firmware.
Reset the printer and recalibrate.
Manually lower the bed screws to create more clearance before homing.

Kobra 3 Z Offset Keeps Changing

The Kobra 3 from Anycubic is another popular printer with Z offset issues. Many report that the Z offset keeps shifting between prints.

Likely causes:

Loose probe or bed.
Auto leveling data overwritten by G-code.
Firmware failing to remember settings.

Tips:

Tighten all mechanical parts.
Manually set and save Z offset after every bed leveling (M500).
Review the start G-code to ensure it doesn’t use a default Z height.

Ender 3 Z Axis Won’t Go Negative

If your Ender 3’s Z axis won’t go negative, it becomes impossible to fine-tune the Z offset below zero — a common requirement.

Possible causes:

Firmware restriction.
Soft endstops enabled.
Z probe offset not correctly configured.

Solution:

Use G-code M211 S0 to disable soft endstops temporarily.
Adjust the Z probe offset using M851 Z-<value> followed by M500.

Ender 3 V3 Plus Z Offset

The Ender 3 V3 Plus includes a CR Touch sensor, which means it performs auto bed leveling but still needs a Z offset configuration.

To properly set the Z offset:

Run “Auto Home.”
Go to “Move Axis” > “Move Z” and adjust carefully.
Slide a paper under the nozzle to feel slight drag.
Save using the on-screen “Store Settings” or M500.

Extra tip: Always double-check that your slicer doesn’t include a Z offset that overrides your manual input.

Additional Tips to Prevent Z Offset Issues

Update Firmware: Make sure your printer runs the latest stable firmware.
Preheat Before Calibration: Heat the nozzle and bed before setting Z offset.
Check Start G-code: Ensure your slicer doesn’t have an unwanted G92 Z0 or G28 after leveling.
Use Baby Stepping: Use live Z adjust during the first layer if supported.
Inspect Bed Leveling Sensor: Clean the CR/BL Touch or optical sensor before calibration.

Conclusion

Z offset is one of the most critical calibrations in 3D printing, especially for printers like the Ender 3 V3 SE, V3 Plus, and Kobra 3. If your printer auto homes and ignores Z offset, it’s likely a firmware, G-code, or user calibration issue. By following proper calibration procedures, ensuring EEPROM settings are saved, and updating firmware, you can fix Z offset issues and enjoy perfect first layers every time.