Introduction
The AMS 2 Pro gives your printer the ability to handle multiple filaments seamlessly while keeping them dry for optimal performance.
This guide will walk you through the most important maintenance steps to keep your AMS 2 Pro running reliably over time.
Overview:
Proper functioning of the AMS 2 Pro relies on the cleanliness and integrity of key components, including the PTFE tubes, tube couplers, feeding funnel, support shaft, and the internal desiccant packs.
Each part plays a vital role in the smooth handling of filament and protection against moisture. Regularly inspecting and maintaining these systems will help ensure hassle-free, uninterrupted printing.
Preventive Maintenance and Care:
The AMS 2 Pro operates most efficiently when its core components remain clean, dry, and properly aligned.
Users should establish a routine maintenance schedule that includes visual inspections and part replacements at recommended intervals.
Filament Care:
Always store and use dry filament. Moisture absorption weakens filament structure, leading to brittleness and feeding errors. The AMS 2 Pro’s integrated drying system helps maintain low humidity, but users should regularly inspect the desiccant packs and replace them when the color indicator shows saturation or after approximately four to six weeks of continuous use.
Approved Filament Types:
Only use filaments officially approved for AMS systems. Incompatible materials such as flexible TPU may stretch, deform, or jam within the feeding path. Refer to Bambu Lab’s filament compatibility list for specific material recommendations.
System Cleanliness:
Regular cleaning prevents dust and filament residue from accumulating inside the unit. Debris around the feeding areas, couplers, or the active support shaft can increase friction and affect sensor accuracy. Using a soft brush or compressed air, gently remove any visible debris during each maintenance cycle.
Filament Hub Maintenance:
Check the filament hub regularly for debris accumulation inside the unit and inspect whether the magnets corresponding to the four slots show signs of wear. Debris buildup or worn magnets can cause feeding and detection issues. For detailed instructions on disassembling and cleaning the internal hub unit, refer to Dismantling and cleaning the AMS internal hub unit.
Firmware Updates:
Always ensure that both the AMS 2 Pro and the connected printer operate on the latest firmware versions. Firmware updates often include improved drying algorithms, enhanced feeding logic, and error detection refinements, which directly contribute to maintenance efficiency and reliability.
PTFE Tube Maintenance
Inspection:
Routinely inspect all PTFE tubes for signs of wear, deformation, or blockage. Over time, these tubes can become kinked, scratched, or clogged with debris, leading to increased friction and potential feeding errors.
Replacement Frequency:
Replace the PTFE tubes if you notice feeding errors, resistance when loading filament, or after extended heavy use, in particular with abrasive or composite filaments.
Installation Guidance:
Ensure each tube is cut cleanly (no fraying), fully seated in the coupler, and routed without sharp bends.
- Replacement Part.
- AMS 2 Pro PTFE Tube (AMS Internal)
- PTFE Tube from AMS 2 Pro to H2 Series Printer
PTFE Tube Coupler - Pneumatic Connector
Inspection:
The couplers (pneumatic connectors) secure the PTFE tubes at both ends to ensure a tight, airtight fit. Periodically check each coupler for looseness, surface cracks, or wear.
Replacement:
If a coupler shows signs of failure, replace it promptly. Failing to maintain these joints can result in increased filament friction, jams that compromise print quality.
For instructions on replacing the PTFE tube coupler’s pneumatic connector, see the official guide: Replacing the pneumatic connector (PTFE Tube Coupler) This guide covers when to replace, how to remove, and how to reinstall the pneumatic connector for all compatible Bambu Lab units.
- Replacement part:
PTFE Tube Coupler
Maintenance Cycle:
Perform coupler inspection at every filament/spool change, during scheduled service, or if repeated feeding issues occur.
AMS 2 Pro Feeding Funnel
Inspection:
Regularly inspect the feeding funnel for grooves, wear, or filament shavings. AMS 2 Pro uses improved ceramic funnels, which have greater durability compared to earlier designs.
Additionally, inspect the feed inlet assembly to check if the internal sensor magnets are worn, especially when experiencing abnormal feed detections such as failure to detect filament insertion or detecting filament when none is present. Refer to the AMS 2 Pro feeding funnel cleaning guide for detailed troubleshooting of sensor-related issues.
Replacement:
Replace the funnel if you notice persistent feeding drag, deformation, or noticeable groove formation. Always use official AMS 2 Pro funnel parts for best fit and reliability.
Consult the official AMS 2 Pro feeding funnel cleaning guide for cleaning instruction and sensor troubleshooting.
- Replacement Part
Coming Soon
Cleaning:
Gently clean out any debris or filament remnants from the funnel during maintenance intervals using an approved brush or air duster.
Check for grooves or damage to minimize drag and motor overload errors.
AMS Active Support Shaft Assembly
Inspection:
Check the active support shaft for correct alignment and signs of wear or debris accumulation. Misalignment or excessive dust can lead to filament jams and motor overloading.
Cleaning:
In case of noise, stiffness, or mechanical issues, inspect the AMS 2 Pro support shaft for dust, debris, or alignment issues; clean with a soft brush or air duster.
Replacement:
If shaft components show signs of mechanical damage or cannot be aligned/lubricated effectively, follow the official AMS 2 Pro assembly replacement guides.
- Replacement Part
AMS 2 Pro Active Support Shaft Assembly
For a visual step-by-step guide:
- Disassembly: Watch from 1:09 to 1:20 minutes for the active support shaft removal steps.
- Reassembly: Watch from 13:53 to 14:21 minutes for the reinstallation steps.
You can watch the official Bambu Lab AMS 2 Pro Disassembly & Assembly Guide video.
Desiccant for AMS
Inspection:
Regularly inspect desiccant packs during scheduled maintenance or filament changes. Look for color change indicators or physical signs of saturation as shown in the manufacturer’s documentation.
Replacement:
Replace desiccant packs immediately if indicator shows saturation, or at intervals suggested by Bambu Lab, typically after several weeks of active use.
- Replacement Part
Desiccant for AMS Unit
ams2pro-desiccant-status-1.png
Installation Guidance:
Install new desiccant packs only in the designated holders or slots. Ensure the packs fit snugly and do not obstruct filament spool movement or airflow.
Refer to this article on how to dry your filament using the AMS 2 Pro.
Troubleshooting & Corrective Maintenance
Despite regular preventive care, operational issues can occasionally arise. Follow these troubleshooting and corrective maintenance steps for the AMS 2 Pro:
Filament breaks in the feeder or PTFE tube
If the filament breaks or gets jammed inside the AMS or PTFE tubes, the printer may display an error on the touchscreen such as “Filament broken in path.”. You will also notice that you are unable to load new filament in a certain slot.
This usually happens when the filament has absorbed too much moisture, which makes it brittle and more likely to snap. To prevent this, always keep your filament dry and store it properly, as dry filament is much stronger and less likely to cause feeding issues.
An easy solution to try is to simply disconnect the white PTFE tubes and try to remove the broken filament.
The drying feature doesn't work
If the AMS 2 Pro is not drying filament or does not let you start the drying process, first check the connections. A single AMS can only dry the filament when the 6-pin cable is properly connected to the H2S.
If you are using multiple AMS 2 Pro units, each one also needs to be plugged into its own power adapter for drying to function correctly.
If the LED light turns red
The AMS 2 Pro indicates the internal operating status of the device via LED light. A steady white light means the system is working properly with all functions operating smoothly. If the LED light of a single Feeder Unit flashes red, it usually indicates that the Feeder Unit has not detected filament after the start of printing, and normal operation can be resumed by inserting the filament. A steady red light indicates that the Feeder Unit has not detected filament but the internal Filament Hub has, which may be due to the filament breaking inside the internal filament hub.
These lights are designed to give you a quick way to know if something is wrong. If you see a flashing or solid red light, the first step is always to check the filament path and the AMS cable. For the full list of LED patterns and what they mean, see the Bambu LED Status Guide. Refer to the chart below for a quick reference of LED behaviors:
Заключение
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