Multi-material and multi-color printing has gone from a premium luxury to a standard that Bambu Lab has put within reach of beginners. The question is no longer whether to print in multiple colors, but with which system. AMS Lite and AMS 2 Pro represent two different philosophies: an open, lightweight frame for the A1 series versus an enclosed box with drying for the X1, P1, and H2 lines. The difference in price, features, and compatibility is significant, and the wrong choice means either wasted money or a missing feature you’ll soon wish you had. This article breaks down how the two systems differ, when you actually need drying, and what criteria to base your decision on.
What is AMS Lite and who is it for?
AMS Lite is an open filament feeder designed for the Bambu Lab A1 series, meaning the A1 and A1 mini models. Unlike the enclosed versions, it’s a lightweight design with four external holders where the spools sit freely on rollers. The system handles automatic filament loading, swapping filament mid-print, and reading the RFID chips on genuine Bambu Lab spools, so the printer knows the material type and color on its own.
Its key trait is also its biggest limitation. AMS Lite is open. It has no enclosed chamber, no active drying, and no sealed storage. The spools are exposed to the surrounding air just as if they were sitting on an ordinary stand. For multi-color printing with PLA or PETG this usually doesn’t matter, but with hygroscopic materials the open design shows its downsides.
So who is it for? Primarily for beginners and hobbyists who bought an A1 mini for its low price and simplicity, yet still want four-color printing. AMS Lite is often part of the Combo bundle with the printer and represents the most affordable path to multi-material printing in the Bambu Lab ecosystem.
What is AMS 2 Pro and how is it different?
AMS 2 Pro is an enclosed unit that Bambu Lab sums up with the tagline of drying, storage, and feeding in one box. At $299 (€289 in the EU) it offers everything the standard AMS does at $249 (€239), and adds an active drying module, continuous moisture removal, and real-time temperature and humidity readings. It’s the successor to the original AMS and targets the X1, P1, and newer printers that support the standard AMS.
The design is enclosed and sealed, so the filament is protected from airborne moisture even between prints. That’s a significant step up from the open AMS Lite. The system holds four spools, reads RFID, and through the AMS hub you can connect up to four units for printing up to sixteen colors in a single job.
The drying function is the main added value. AMS 2 Pro can heat filament to a maximum of 65°C and keep humidity low even during storage. For common materials like PLA and PETG that’s enough, but with more demanding filaments it runs into a limit we’ll cover below.
Compatibility decides: the printer picks the system
In practice, the printer itself often makes the choice for you. AMS Lite is designed exclusively for the A1 series and won’t mount on the X1 or P1 lines. Conversely, the AMS 2 Pro and standard AMS fit the X1 and P1 printers, where they install on top on two side rails, but they don’t work with the open frame of the A1 series.
This split isn’t accidental. The A1 series is designed as an affordable printer with a moving print bed (a bed slinger) and open-axis motion, where an enclosed drying box doesn’t make sense structurally. The X1 and P1 lines are enclosed CoreXY machines, where chamber heat and working with more demanding materials logically lead to the need for drying and sealed storage.
The practical conclusion follows from this. If you already own an A1 or A1 mini, your only path to integrated multi-material printing is AMS Lite. If you have an X1C or P1S, you’re choosing between the standard AMS and AMS 2 Pro. So the real decision between the two systems mainly comes up when you’re still choosing an entire printer and ecosystem.
Filament drying: the biggest functional difference
The most noticeable difference between the two systems lies in how they handle moisture. Filament is hygroscopic, meaning it absorbs water from the air, and damp material shows up during printing as stringing, popping in the nozzle, a matte surface, and worse mechanical properties. PETG, PA (nylon), and other technical materials are especially sensitive to moisture.
AMS 2 Pro addresses this problem directly. The drying module heats the interior up to 65°C, actively vents moisture out, and offers what’s called a rotary drying mode, where according to Bambu Lab’s documentation the spool rotates 30° every five minutes for even heating. This mode gives the best results and suits most filaments. The alternative is static drying, where the filament stays loaded in the inlet and relies on hot air circulation in the chamber.
When drying, though, you need to watch out for material combinations. According to Bambu Lab’s documentation, when drying ABS or PETG you have to remove PLA and TPU from the unit, since they would soften at the higher temperatures. AMS Lite can do none of this. Damp filament has to be dried externally, for example in a standalone dryer, and only then loaded.
Sealed storage versus an open frame
Drying solves the acute problem of damp filament, but sealed storage solves the long-term one. AMS 2 Pro keeps filament in an enclosed, sealed chamber where it stays protected from airborne moisture even when you’re not printing. The standard AMS also offers sealed storage, but it lacks active drying.
AMS Lite, on the other hand, has no enclosed chamber. The spools sit on open rollers and are permanently exposed to the surrounding air. In a dry environment that’s fine, but in a humid apartment or garage the filament gradually takes on water and its properties deteriorate. The difference shows up most with spools that have been partially used and left sitting for a while.
If you print in bursts and use up a spool quickly, you’ll barely notice the open frame. If you have several materials on the go and come back to them weeks later, you’ll appreciate the sealed storage of the AMS 2 Pro. Practice shows that partially used spools left sitting for a long time are the most common source of quality problems with open systems.
Supported materials and their limits
In terms of supported materials, the two systems are close. They handle PLA, PETG, ABS, ASA, PET, PA, PC, dried PVA and BVOH, PP, POM, HIPS, and select Bambu Lab composites like PLA-CF, PAHT-CF, and PETG-CF. On the other hand, generic TPU, TPE, wet PVA, and filaments containing carbon or glass fibers won’t pass through the standard AMS feed path, because they’re too soft or abrasive. The exception is TPU for AMS (68D hardness), which works through the standard feed — regular softer TPU (85A–95A) doesn’t.
When it comes to drying, though, AMS 2 Pro has a ceiling. Filaments that require a higher drying temperature, typically ABS, ASA, PA, or PC, can’t be fully dried by the AMS 2 Pro with its 65°C. For these demanding materials Bambu Lab recommends the AMS HT unit ($139 / €129), which dries up to 85°C. The AMS HT specializes in high-performance materials and stands as a separate category beyond the AMS Lite versus AMS 2 Pro comparison.
Compatibility of a specific spool varies by material and manufacturer. Before you order filament expecting it to run in the AMS without any fuss, it pays to verify whether the unit can actually work with it. Check it for your material below.
Pros and cons of both systems
Summing up the strengths and weaknesses, a clear picture of two differently focused products emerges.
The price difference between the standard AMS at $249 and the AMS 2 Pro at $299 amounts to fifty dollars for integrated drying and humidity monitoring. If you print mostly PETG or technical materials, this surcharge almost always pays for itself, since a standalone filament dryer costs about the same and takes up more space on your desk.
- AMS Lite pros: the most affordable path to four-color printing, part of the A1 Combo bundle, easy installation, easy access to spools
- AMS Lite cons: no drying, no sealed storage, spools exposed to moisture, A1 series only
- AMS 2 Pro pros: active drying up to 65°C, rotary mode, sealed storage, real-time humidity monitoring, expandable via the AMS hub
- AMS 2 Pro cons: higher price of $299, X1, P1, and newer only, still needs the AMS HT for demanding materials
When is each system worth it?
The choice between the two systems can be narrowed down to a few clear scenarios. What matters is the type of printer, the materials you work with, and the climate you print in.
AMS Lite is worth it if you own an A1 or A1 mini and mostly print multi-color decorative models, toys, and accessories from PLA. PLA is relatively resistant to moisture, and the open frame is no problem here. For a beginner who mainly wants colors and doesn’t want to deal with drying, it’s a logical and cheap choice.
AMS 2 Pro is worth it once you’re working with PETG, ABS, ASA, or nylon and you care about quality and consistency. Integrated drying and sealed storage solve a problem you’d otherwise have to handle manually and externally with an open system. The benefit grows in a humid environment and for people who print often and don’t want to re-dry filament every time.
If you’re still choosing an entire printer, this consideration factors into the decision too. An enclosed X1 or P1 machine with the AMS 2 Pro makes sense for an all-purpose workshop with ambitions for technical materials, while an A1 mini with AMS Lite is an ideal entry point for multi-color hobby printing.
Comparing AMS Lite and AMS 2 Pro isn’t a contest of better versus worse, but of two differently focused systems that your chosen printer usually decides for you. AMS Lite is the lightweight, open, and cheap route to multi-color printing on the A1 series, where drying and sealed storage are missing. AMS 2 Pro adds active drying up to 65°C, a rotary mode, and humidity monitoring for $299, and suits the X1, P1, and more demanding materials. The practical rule: for PLA and colors, AMS Lite is enough; for PETG and technical work, reach for the AMS 2 Pro, and for filaments that require a higher temperature, count on the AMS HT on top.
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