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HMS_0300_0200

Bambu Lab 3D Printer

Severity:

Source: OnlyErrorCodes.com — Every error code. One place.

Bambu Lab HMS_0300_0200 — Filament Runout

What Does This Error Mean?

HMS_0300_0200 on a Bambu Lab printer means the filament has run out mid-print. The printer pauses automatically. Load a fresh spool of the same filament colour and material, then press Resume to continue from where it stopped.

Affected Models

  • Bambu Lab X1 Carbon
  • Bambu Lab X1
  • Bambu Lab P1S
  • Bambu Lab P1P
  • Bambu Lab A1

Common Causes

  • Spool ran empty during a long print
  • AMS detected the end of a spool that was too short for the print job
  • Filament snapped between the spool and the AMS — printer reports as runout
  • AMS sensor mis-detected an empty slot when the spool was actually full

How to Fix It

  1. Confirm the print is paused, not failed.

    When HMS_0300_0200 triggers, the print pauses and the toolhead lifts. The printer waits for filament to be reloaded — it has not failed the job.

  2. Identify which slot ran out.

    On the Bambu Lab display or in Bambu Studio, the AMS slot showing the runout is highlighted. If using a single external spool (P1P style), the runout is on the external feed.

  3. Load a fresh spool of matching filament.

    Use the same brand, material, and colour. Mismatched filament will visibly show a join in the print. Pre-heat the nozzle if the printer has cooled during the pause.

  4. Run the AMS load procedure.

    On the touchscreen, select the empty slot and press Load. The AMS feeds filament until the buffer detects it. Wait for the printer to confirm 'Loaded'.

  5. Press Resume.

    The printer purges a small amount of filament to clear any partial flow, then continues from the last layer. Inspect the join layer when the print finishes.

Frequently Asked Questions

Why did HMS_0300_0200 trigger when I had a full spool loaded?

If the filament snapped between the spool and the AMS, the AMS reads it as a runout. Open the AMS, locate the broken filament, feed the cut end back in, and reload the slot.

Can I resume a Bambu Lab print left paused for hours?

Yes for a few hours, but layer adhesion at the join may be weaker. For overnight pauses, the print bed can warp or detach if the heater turns off — accept that long pauses risk a layer separation line.