Error 1252 on the Elegoo Centauri Carbon 2 Combo appears when the printer cannot unload filament from the toolhead during a filament-change operation — either the filament fails to retract cleanly or the filament strand has snapped and a broken piece is lodged inside the PTFE tube.

What the Error Means

During a filament change, the printer commands the extruder to retract the filament all the way out of the nozzle and PTFE path. Error 1252 fires when the unload does not complete within the expected time or stroke length. Two common failure modes: first, filament that has bled or cooled in the nozzle is stuck and will not retract without softening; second, the filament has become brittle (especially older PLA left in dry conditions) and snaps mid-retract, leaving a broken piece inside the PTFE tube that blocks subsequent loading attempts.

Step-by-Step Fix

1. Heat the nozzle to the print temperature of the currently loaded filament — PLA typically 200 °C, PETG typically 230 °C, ABS typically 240 °C. Do not attempt to pull or load filament at room temperature.
2. Manually push the filament forward by a few millimetres while the nozzle is hot, then trigger Unload from the touchscreen menu. The forward push clears any cold plug at the nozzle tip before the retract begins.
3. If you suspect the filament has snapped inside the PTFE tube, power off the printer. Release the PTFE tube from the toolhead via the push-fit quick-release collar at the toolhead end.
4. Push a thin metal rod or spare filament strand down from the top of the PTFE tube to force the broken piece out the bottom. Do not pull from the nozzle end as this risks embedding the fragment further.
5. Inspect the PTFE tube for a worn bore (cloudy or brownish inner surface), tight bends, or a compressed inner diameter near the push-fit fittings — all of these cause excess friction that leads to filament breaks.
6. Replace the PTFE tube if the bore is visibly damaged. Use a Capricorn or Elegoo-compatible PTFE tube cut to the correct length for the Centauri Carbon 2 Combo toolhead.
7. Reload filament and verify a complete load/unload cycle from the touchscreen before resuming printing.

Parts Required

• PTFE tube (Centauri Carbon 2 Combo spec; Capricorn XS for tighter tolerance is a compatible upgrade)
• Spare filament strand or thin metal rod (for clearing broken pieces)

Contact Elegoo support if error 1252 recurs after replacing the PTFE tube — a worn extruder gear or a toolhead feed path obstruction may require further attention.

Frequently asked questions

What does Elegoo 1252 mean?

Error 1252 on the Elegoo Centauri Carbon 2 Combo appears when the printer cannot unload filament from the toolhead during a filament-change operation — either the filament fails to retract cleanly or the filament strand has snapped and a broken piece is lodged inside the PTFE tube.

How do I fix Elegoo 1252?

Elegoo error 1252 means filament failed to unload or broke inside the PTFE tube on the Centauri Carbon 2 Combo. Learn to heat the nozzle, push out the break, and inspect the tube.