Error code 1243 on the Elegoo Centauri Carbon 2 Combo identifies a filament path interruption between the 4-in-1 hub and the CANVAS system, or a clogged hotend nozzle preventing extrusion. In either case, the tool head filament detection sensor is not being reached and the printer halts the operation.

What the Error Means

Unlike error 1242, which covers the entire feed path timing out, error 1243 specifically points to a broken or severed filament strand lodged inside the PTFE tube between the hub and the CANVAS, or to a nozzle clog severe enough to prevent material from passing through even when the PTFE path is clear. Brittle filament (particularly dried-out or old material) is prone to snapping inside the tube, leaving a short stub that blocks the next load attempt. A clogged nozzle from carbonized material or a cold plug can produce identical symptoms. Identifying which scenario applies early saves time: if the PTFE path is clear but no material extrudes during a manual purge, the nozzle is the problem.

Step-by-Step Fix

1. Check the spool for tangles or knots on the affected channel — rule out a feed restriction at the source before opening the printer.
2. Pull filament manually back from the affected CANVAS channel. If a short broken piece comes out, the PTFE tube likely contains a stub. Insert fresh filament to push the stub clear, or disassemble the PTFE path to extract it with tweezers.
3. Loosen the two hub screws (2.0 mm Allen key) and remove the 4-in-1 hub from the frame. Insert a fresh piece of filament through each hub channel by hand to confirm unobstructed flow.
4. Reconnect the hub and attempt a manual purge with the hotend heated to the filament’s printing temperature. If material extrudes cleanly, the path is clear and error 1243 should not return.
5. If no material extrudes during the manual purge despite a clear PTFE path, the hotend is clogged. Perform a cold pull: heat to printing temperature, let it cool to 90 °C, then pull the filament out sharply to extract the clog.
6. Repeat the cold pull up to three times if needed. After a successful pull, reload filament and confirm clean extrusion before resuming printing.
7. If a filament stub is suspected but cannot be retrieved by hand, disassemble the PTFE tube section between the hub and CANVAS, extract the broken piece, and re-insert a clean filament end.

Parts Required

• 2.0 mm Allen key
• Replacement PTFE tube section (if tube is damaged during stub removal)
• Flush cutters (to trim clean filament ends)

Contact ELEGOO support if error 1243 recurs frequently on a specific channel, as repeated filament breaks in the same location may indicate a PTFE tube defect or a sharp edge at a fitting.

Frequently asked questions

What does Elegoo 1243 mean?

Error code 1243 on the Elegoo Centauri Carbon 2 Combo identifies a filament path interruption between the 4-in-1 hub and the CANVAS system, or a clogged hotend nozzle preventing extrusion. In either case, the tool head filament detection sensor is not being reached and the printer halts the operation.

How do I fix Elegoo 1243?

Error 1243 on the Elegoo Centauri Carbon 2 Combo signals a broken filament strand in the PTFE path or a clogged nozzle. This guide walks through both scenarios.