Error code 1265 on the Elegoo Centauri Carbon 2 Combo indicates a detection mismatch between the 4-in-1 hub and the tool head: the hub-level sensor registers that filament is present in the hub, but the trigger sensor downstream inside the tool head never activates during the feeding process. The printer halts to avoid continuing with an uncertain filament state.

What the Error Means

The Centauri Carbon 2 Combo tracks filament at multiple checkpoints along the feed path — the hub has its own detection, and the tool head has an independent trigger sensor. Error 1265 fires when the hub sensor sees filament (confirming material is present at the hub) but the tool head trigger does not activate within the expected time. This points to a blockage or restriction in the PTFE path between the hub and the tool head, preventing filament from traveling far enough to reach the downstream sensor. A less common cause is a failed or debris-covered tool head sensor that is not triggering even when filament reaches it. Compare with error 1266 and 1267, which are board-level faults on the filament detection board itself, not a feeding path blockage.

Step-by-Step Fix

1. Pause the print or loading operation from the touchscreen. Avoid canceling immediately so the system holds the filament in position for inspection.
2. Navigate to the filament menu and check which channel is affected. Inspect the PTFE tube from the 4-in-1 hub to the tool head for visible kinks, sharp bends, or compression that could restrict filament travel.
3. Gently push filament by hand from the hub toward the tool head and assess the resistance. Light, smooth travel is normal; heavy resistance indicates a blockage or kinked tube section.
4. If a kink is found, re-route or replace the PTFE tube section between the hub and the tool head. Secure the tube so it cannot form a tight bend during axis movement.
5. Reload the filament on the affected channel and watch whether the tool head trigger activates. If it does, the fix is complete.
6. If the PTFE path is clear but the tool head trigger still does not activate, inspect the tool head sensor for debris, filament residue, or a stuck sensor flag. Clean gently with compressed air or a soft brush.
7. If cleaning does not restore sensor function, the hub or tool head filament sensor may need replacement — contact ELEGOO support for component diagnosis.

Parts Required

• Replacement PTFE tube section (if tube is kinked or damaged)
• Compressed air or soft brush (for sensor cleaning)

If error 1265 persists after clearing the PTFE path and cleaning the sensor, contact ELEGOO support with details of the affected channel and the steps already taken.

Frequently asked questions

What does Elegoo 1265 mean?

Error code 1265 on the Elegoo Centauri Carbon 2 Combo indicates a detection mismatch between the 4-in-1 hub and the tool head: the hub-level sensor registers that filament is present in the hub, but the trigger sensor downstream inside the tool head never activates during the feeding process. The printer halts to avoid continuing with an uncertain filament state.

How do I fix Elegoo 1265?

Error 1265 on the Elegoo Centauri Carbon 2 Combo means the 4-in-1 hub has filament but the downstream tool head trigger never fired. Clear the PTFE path or clean the sensor to resolve it.