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0700_0400
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Bambu Lab · FDM 3D Printers
AMS Filament Not Feeding - Motor Cannot Push Filament to Extruder
Quick Answer
Error code 0700_0400 on your Bambu Lab FDM 3D Printers means: AMS Filament Not Feeding - Motor Cannot Push Filament to Extruder. This is usually fixable — see the step-by-step guide below.
Likely Causes
  1. PTFE tube between AMS and tool head is kinked or has high internal friction
  2. AMS feeder motor is too weak to push the filament due to worn rollers
  3. Filament diameter is slightly oversized causing excessive friction in the tube
  4. Previous clog or filament remnant partially blocking the PTFE path
  5. AMS buffer tube routing creating too many tight bends
How to Fix It
1
Unload all filaments and check each PTFE tube for obstructions by blowing air through them
2
Inspect the AMS feeder rollers for wear and clean with isopropyl alcohol
3
Check the PTFE tube routing for tight bends and reroute with smoother curves
4
Measure the filament diameter with calipers to verify it is within specification (1.75mm +/- 0.03mm)
5
Replace any PTFE tubes that show internal scratching or discoloration
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Replacement PTFE tubes (AMS to tool head, set of 4)
AMS feeder roller replacement kit
Digital calipers for filament measurement
Related Error Codes
0300_01000300_02000300_03000300_04000500_0100
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