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Bambu LabAMS HMS codeWarning0700_2000_0002_00010700-2000-0002-0001

Bambu AMS filament runout error: what it means and how to recover

Recover from Bambu Lab AMS filament runout or feed-state alerts without repeatedly restarting the same failed production job.

Print Hive summary

A runout-style AMS code is a material-delivery problem, not always an empty-spool problem. Treat it like a path isolation exercise: identify whether the failure follows the filament, the AMS slot, or the printer path before sending more jobs to the same setup.

At a glance

  • Runout alerts mean the printer believes the filament path cannot provide material for the next move.
  • Do not assume the spool is empty; check spool drag, filament tip, and AMS slot state first.
  • If the issue follows the spool, quarantine the material; if it follows the slot, inspect hardware path.

Before you begin

  • Label the spool and AMS slot before moving anything.
  • Keep the failed job paused if recovery can resume without losing the print.
  • Have cutters ready so the filament tip can be trimmed cleanly before reload.

Symptoms

  • The printer reports filament runout or a related AMS feed-state code.
  • Filament appears present but the printer cannot continue loading or printing.
  • A job pauses during a material change or after a retract/load cycle.

Likely causes

  • Actual empty spool or filament end not detected until the path needs material.
  • Spool binding, crossed filament, or high-friction cardboard/spool adapter behavior.
  • Filament tip shape, brittle filament, or debris preventing reliable reload.
  • AMS slot or PTFE path is holding stale material state after a failed unload.

Troubleshooting steps

  1. 1Record the code and whether the job was printing, loading, or switching material.
  2. 2Inspect the spool for remaining filament, tangles, crossed winding, and free rotation.
  3. 3Trim the filament tip, reload the slot, and watch whether the AMS advances smoothly.
  4. 4Move the spool to a known-good slot if the job can be safely resumed or reproduced later.
  5. 5Return the printer to production only after a purge or short validation confirms stable feed.

When to escalate

Escalate if multiple known-good spools fail in the same AMS slot or if the printer repeatedly reports runout immediately after successful manual loading.

Official and source links