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0500_0300
Easy Fix
Bambu Lab · FDM 3D Printers
Filament Broken or Runout - No Filament Detected at Extruder
Quick Answer
Error code 0500_0300 on your Bambu Lab FDM 3D Printers means: Filament Broken or Runout - No Filament Detected at Extruder. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
A1A1 MiniP1PP1SX1 CarbonX1E
Likely Causes
  1. Filament spool is empty
  2. Filament snapped between the AMS and the extruder due to brittleness
  3. Filament was pulled too aggressively and broke at a weak point
  4. Filament runout sensor in the tool head has a dirty optical path
How to Fix It
1
Check the filament spool in the AMS or on the spool holder to confirm material remains
2
If the filament broke, remove the remnant from the PTFE tube and extruder path
3
Cut a fresh clean tip on the filament at a 45-degree angle and reload
4
If using the AMS, check the PTFE tube path for any filament debris blocking the path
5
Inspect the filament sensor window in the tool head for dust or debris
Pro Tip
This is a common issue that most users can resolve without specialized tools. Try the first step before moving on to more complex solutions.
Parts You May Need
New filament spool
Replacement PTFE tube (AMS to tool head)
Related Error Codes
0300_01000300_02000300_03000300_04000500_0100
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