Error 1231 on the Elegoo Centauri Carbon 2 Combo means the filament cutter did not complete its cut cycle during a filament-change or multi-material swap operation. The printer relies on a clean filament cut before pulling back the old filament and loading the next color, and an incomplete cut halts the operation to prevent jams.

What the Error Means

The Centauri Carbon 2 Combo includes an integrated filament cutter mechanism — a small servo-driven blade that severs the filament strand as part of the filament-change sequence. Error 1231 fires when the cutter blade does not travel through its full stroke, as detected by the cutter’s position sensor or the servo’s feedback. This typically happens because a stray filament strand or hardened ooze has jammed the blade, preventing it from closing fully. A loose cutter servo connector or a failed servo motor are less common causes.

Step-by-Step Fix

1. Power off the printer before inspecting the cutter mechanism — the blade is sharp and can move unexpectedly if the printer is powered.
2. Inspect the cutter assembly for jammed filament. Look for filament strands threaded around the blade, hardened ooze blocking the blade channel, or a partially cut piece that has folded and stuck. Use tweezers or a dental pick to clear any debris.
3. Manually actuate the cutter if it is safe to do so (with the printer powered off and the blade direction known). Confirm the blade slides freely through its full open-to-close range with no binding.
4. Inspect the cutter servo cable connector at the toolhead board and reseat it firmly.
5. Power on and retry the filament change operation from the touchscreen. Watch for the cutter to complete its stroke cleanly.
6. If the cutter blade moves but does not reach full closure, the blade or blade channel may be worn or deformed. Contact Elegoo support for a cutter replacement.
7. If the cutter does not move at all, the servo motor may have failed. Contact Elegoo support for a cutter servo or toolhead assembly replacement.

Parts Required

• Tweezers or dental pick (for filament debris removal)
• Replacement cutter assembly or cutter servo (only if mechanically failed — via Elegoo support)

If error 1231 recurs during every filament change, contact Elegoo support — a worn blade or a persistent servo fault may require a complete cutter unit replacement.

Frequently asked questions

What does Elegoo 1231 mean?

Error 1231 on the Elegoo Centauri Carbon 2 Combo means the filament cutter did not complete its cut cycle during a filament-change or multi-material swap operation. The printer relies on a clean filament cut before pulling back the old filament and loading the next color, and an incomplete cut halts the operation to prevent jams.

How do I fix Elegoo 1231?

Elegoo error 1231 means the filament cutter did not complete its cut cycle on the Centauri Carbon 2 Combo. Learn to clear jammed filament, free the blade, and reconnect the cutter motor.