Creality error 104 (Foreign Object Detected on Heat Bed) appears on K1, K1 Max, and K1C printers when the bed-scan camera or AI detection system identifies something on the heat bed that should not be there. The printer halts to prevent the toolhead from crashing into unexpected objects before or during a print.

What the Error Means

Before each print job begins, the K1 series captures a bed image and runs it through an AI classifier that looks for debris, leftover filament, misplaced tools, or other objects that would interfere with printing. Error 104 fires when the classifier scores the bed as contaminated. The system is also active during printing and can pause mid-print if material falls onto the bed surface. Common real triggers include plastic debris from a previous print, leftover brim or raft sections, support material fragments, and dried adhesive clumps. False positives are triggered by heavy surface texture on the PEI plate, visible wear marks, or significant glue buildup that the AI reads as a foreign object.

Step-by-Step Fix

1. Cancel or pause the print from the touchscreen.
2. Lift the magnetic spring steel plate off the bed and set it aside. Inspect the bare bed heater surface underneath for debris, fallen filament pieces, or hardware that may have dropped inside the printer.
3. Inspect the spring steel plate itself. Remove any plastic fragments, leftover support stubs, or hardened adhesive blobs with a plastic scraper. Work carefully to avoid scratching the PEI coating.
4. Wipe the plate thoroughly with isopropyl alcohol (90% or higher) using a clean cloth to remove adhesive residue, fingerprints, and fine plastic dust.
5. Reseat the plate flat on the magnetic surface, ensuring it lies without gaps or raised edges.
6. Restart the print job. The system will re-scan the bed before the nozzle moves.
7. If the error fires consistently on a clean bed with no visible debris, navigate to System Settings → AI Detection and disable Foreign Object Detection to bypass the false-positive trigger while still allowing printing.

Parts Required

No replacement parts are typically required for this fix — basic tools only.

Contact Creality support if the error triggers on an unambiguously empty and clean bed, as this may indicate a camera or AI module malfunction.

Frequently asked questions

What does Creality 104 mean?

Creality error 104 (Foreign Object Detected on Heat Bed) appears on K1, K1 Max, and K1C printers when the bed-scan camera or AI detection system identifies something on the heat bed that should not be there. The printer halts to prevent the toolhead from crashing into unexpected objects before or during a print.

How do I fix Creality 104?

Creality K1/K1 Max/K1C error 104 means the bed-scan AI detected a foreign object before or during printing. Clear the bed and restart to resolve this error.