Bambu Lab AMS 2 Pro — Product Spotlight
The Bambu Lab AMS 2 Pro is the second-generation automatic material system, adding active filament drying, a faster brushless feeding motor, and improved maintenance access to the multi-colour printing capability of the original AMS. It is compatible with all Bambu Lab printer series — A1, A1 Mini, P1, P2, X1, X2D, and H2 — making it the most broadly compatible AMS unit in the range. For users who print with moisture-sensitive materials or want the most capable and future-proof AMS option, the AMS 2 Pro is the current standard.
Active Filament Drying
The most significant addition over the standard AMS is the integrated drying system. The AMS 2 Pro heats to up to 65°C with electromagnetic air venting that cycles humid air out of the sealed housing during the drying phase, then seals the enclosure afterwards to maintain a low-humidity storage environment. During drying, the spools rotate automatically to ensure even heat distribution across the full filament wound on each spool rather than just the outer layer.
RFID recognition of official Bambu Lab filaments extends to the drying system: when a recognised spool is loaded, the AMS 2 Pro automatically selects the recommended drying temperature and duration without manual input. For third-party filaments, temperature and duration can be set manually. This matters practically because different materials have different drying requirements: PLA typically needs 45–50°C for 4–6 hours, PETG 65°C for 6 hours, and PA (nylon) 70–80°C for 12 or more hours. The AMS 2 Pro handles the first two categories well; for PA and other materials requiring above 65°C, the AMS HT with 85°C drying is the better choice.
Faster Feeding and Better Maintenance
The AMS 2 Pro uses a brushless servo motor that feeds filament 60% faster than the first-generation AMS motor. Faster feeding reduces the time spent loading and purging between colour changes, which is particularly noticeable on prints with many colour switches. Ceramic filament inlets with a Vickers hardness of 1200 resist wear from abrasive composite filaments far better than standard plastic inlets, extending the service life of the unit when printing PA-CF, PETG-CF, and similar materials.
Maintenance access is improved over the original AMS: the filament tubes are accessible from the top of the unit without disassembly, and clearing a filament tangle or jam that would have required removing spools and unscrewing panels on the first-gen unit can be resolved tool-free on the AMS 2 Pro.
Printer Compatibility
The AMS 2 Pro is compatible with the full Bambu Lab printer range. Some printer models require additional accessories for the connection or drying function to work correctly:
For P1S and X1 series owners, the filament feeding function requires a 6-pin bus cable, 4-pin bus cable, Filament Buffer or AMS Hub, PTFE tube, and PTFE tube coupler. The drying function additionally requires an external power adapter. For P2S owners connecting one or two AMS units, a Filament Buffer (P2S) and Bambu Bus Cable are needed. For A1 and A1 Mini owners, an AMS Hub accessory is required to connect the AMS 2 Pro. H2D and H2S printers can power one connected AMS 2 Pro for drying directly without an external adapter. Check the compatibility notes for your specific printer model before purchasing.
Multiple AMS 2 Pro units can be connected in series for up to 16 filaments across four units. AMS 2 Pro units can also be mixed with AMS HT units in multi-unit setups on supported printers.
When to Choose AMS 2 Pro vs AMS HT
The AMS 2 Pro covers the vast majority of common filaments: PLA, PETG, TPU, ABS, ASA, and most composite variants. Its 65°C maximum drying temperature handles these materials adequately. The AMS HT is the appropriate choice when regularly printing with high-temperature engineering materials like PA12-CF, PPS, PEI, or other polymers that require drying temperatures above 65°C to properly remove absorbed moisture before printing. If your material range stays within PLA, PETG, ABS, ASA, and standard composites, the AMS 2 Pro is sufficient.
Frequently Asked Questions
Does the AMS 2 Pro dry filament while printing?
The AMS 2 Pro is primarily designed to dry filament during standby, before a print begins. Active drying simultaneously with printing is not a supported workflow — the electromagnetic vent that cycles humid air out during drying operates independently of the feeding mechanism. The standard practice is to dry filament before loading it for a print, using the AMS 2 Pro as a drying station between print sessions.
What is the difference between AMS 2 Pro and AMS HT?
The AMS HT dries at up to 85°C compared to the AMS 2 Pro's 65°C, making it suited to high-temperature engineering filaments that need above 65°C for effective moisture removal. The AMS HT also uses an air-tight sealed design and brushless servo feeding motor. For standard filaments including PLA, PETG, ABS, and common composites, the AMS 2 Pro is adequate. The AMS HT is the choice when regularly printing with PA, PPS, PEI, or similar high-temperature polymers.
Can I use AMS 2 Pro with my existing P1S?
Yes, but additional accessories are required. For P1S owners, the feeding function requires a 6-pin bus cable, 4-pin bus cable, Filament Buffer or AMS Hub, PTFE tube, and PTFE tube coupler. The drying function additionally requires an external power adapter. Check the accessory requirements for your specific printer configuration before purchasing.
How many AMS 2 Pro units can I connect?
Up to four AMS 2 Pro units can be connected to a compatible printer for up to 16 filament slots. AMS 2 Pro units can also be mixed with AMS HT units in multi-unit configurations on supported printers, depending on the printer model and accessory setup.
Summary
The Bambu Lab AMS 2 Pro is the most capable general-purpose automatic material system in the range, combining multi-colour printing with active 65°C filament drying, fast brushless feeding, and broad compatibility across all Bambu Lab printer series. It is the recommended AMS choice for most users, with the AMS HT reserved for workflows that regularly require above-65°C drying. View the Bambu Lab AMS 2 Pro at Everyday Home Living, and browse the full 3D Printers collection.