Anycubic error 10120 (Z-Axis Homing Failed) appears on the Kobra 3, Kobra X, and Kobra S1 when the printer tries to home the Z axis and fails to receive confirmation that the printhead has reached the correct zero position. The machine halts to prevent the nozzle from driving into the build plate.

What the Error Means

The Z axis lowers the printhead (or raises the bed, depending on the model) toward the print surface until a limit switch or auto-leveling sensor signals contact. Error 10120 fires when that signal does not arrive in time, which typically means a loose Z-axis motor cable, a seized or under-lubricated lead screw preventing smooth travel, a physical blockage along the Z column, or a leveling sensor that has failed or become disconnected. On the Kobra S1 with its strain-gauge leveling system, a dirty or damaged sensor head can also produce this fault.

Step-by-Step Fix

1. From the touchscreen navigate to Move Axis and command the Z axis to move up and then down. Confirm the printhead or gantry actually responds — a silent, unmoving axis points directly to the motor cable or driver.
2. Power off the printer. Unplug and firmly reseat the Z-axis motor cable connector at both the motor and the mainboard port. Tug gently on each wire in the connector to feel for any that have backed out.
3. With the printer off, manually turn the lead screw by hand to feel for binding, grit, or rough spots. Apply a small amount of PTFE-based lubricant to the lead screw if movement feels stiff.
4. Visually inspect the full height of both Z columns for any object that could block downward travel — a fallen tool, screw, or clump of filament is a common culprit.
5. Check the auto-leveling sensor cable at both the printhead and mainboard ends. Reseat the connector and confirm the sensor body is not cracked or physically damaged.
6. Retry homing from the touchscreen. If the axis now homes cleanly, run a test print to confirm the first layer is correct.
7. If the Z axis still fails to home, the motor or mainboard driver may be damaged. Contact Anycubic support for replacement guidance.

Parts Required

• PTFE-based lead screw lubricant (e.g., Super Lube)
• Replacement Z-axis stepper motor (if motor is confirmed faulty)
• Replacement auto-leveling sensor (if sensor is damaged)

If error 10120 persists after lubrication and cable reseating, contact Anycubic support for further assistance.

Frequently asked questions

What does Anycubic 10120 mean?

Anycubic error 10120 (Z-Axis Homing Failed) appears on the Kobra 3, Kobra X, and Kobra S1 when the printer tries to home the Z axis and fails to receive confirmation that the printhead has reached the correct zero position. The machine halts to prevent the nozzle from driving into the build plate.

How do I fix Anycubic 10120?

Anycubic error 10120 means the Z axis could not complete homing. Diagnose motor cables, lead screw binding, and leveling sensor issues on Kobra 3, Kobra X, and Kobra S1.