AMS Filament Stuck / Jammed
Bambu Lab 3D Printer
Severity: ModerateWhat Does This Error Mean?
AMS Filament Stuck means the Automatic Material System cannot load or unload filament. The filament may be tangled, the path may be clogged, or the AMS hub has a jam. Open the AMS, manually feed or retract the filament, and check for tangles.
Affected Models
- Bambu Lab X1 Carbon
- Bambu Lab X1
- Bambu Lab P1S (with AMS)
Common Causes
- Filament tangled on the spool inside the AMS
- Filament end cut at a bad angle — cannot enter the Bowden tube
- Clog in the AMS hub where filaments merge
- Bowden tube between AMS and printer kinked
- Filament too brittle (old or moisture-damaged)
How to Fix It
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Open the AMS lid and check for tangles on the spool.
Tangles are the #1 cause. If the filament crossed over itself on the spool, it jams when the AMS tries to pull. Unwind the tangle and re-seat the spool.
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Cut the filament end at a sharp 45-degree angle.
A blunt or frayed filament end cannot enter the Bowden tube. Cut a clean angled tip and try loading again.
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Check the AMS hub for a clog.
Remove the Bowden tubes from the hub and check for broken filament pieces inside. Use tweezers to remove any debris.
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Manually push or pull the filament through the path.
Sometimes you need to manually guide the filament past a sticky point. Use the AMS menu to assist with loading/unloading.
Frequently Asked Questions
What is the AMS?
The AMS (Automatic Material System) is Bambu Lab's multi-filament system. It holds 4 spools and automatically switches between them for multi-colour or multi-material printing.
Can I use any filament in the AMS?
Most 1.75mm filaments work. But very flexible (TPU) or very brittle filaments can cause jams. Bambu Lab recommends their own filament for best AMS reliability.