Bambu Lab AMS
The Bambu Lab AMS is a $249 four-spool multi-material system that bolts onto the P1S, P1P, X1C, and X1E printers, delivering automatic color and material switching with RFID auto-detection on Bambu spools. Up to four AMS units daisy-chain for 16-color prints, with a humidity sensor and desiccant compartment to keep filament dry between jobs.
Best multi-material system for P1S/X1C owners — incompatible with the A1 series.
Where to Buy
Pros
- 4 spools per unit, daisy-chains up to 4 units for 16 colors in a single print
- RFID auto-detection on Bambu filament loads brand, color, and dry settings
- Humidity sensor and desiccant compartment keep PLA and PETG dry between jobs
- Supports PLA, PETG, ABS, ASA, TPU 95A+, PVA, and PA-CF materials
- 100-150mm³ purge per swap is competitive with other multi-material systems
Cons
- NOT compatible with the A1 series — those need the AMS Lite
- Purge waste adds 1-2g per color change; 16-color prints accumulate hundreds of grams
- TPU below 95A shore hardness does not feed reliably through the AMS
- Humidity sensor only reads inside the AMS — doesn't help with shelf-stored spools
Compatibility, Daisy-Chaining, and the A1 Trap
The Bambu Lab AMS connects to the P1S, P1P, X1C, and X1E via a 4-wire control cable and a single PTFE filament tube per slot. Bambu Studio recognizes the AMS automatically and exposes its 4 slots in the slicer. To go beyond 4 colors, you daisy-chain up to 4 AMS units through dedicated AMS hubs, reaching a 16-color maximum. Each additional unit adds $249 plus a $20 hub, so a full 16-color rig runs around $1,100 in addons before you account for filament.
The A1 incompatibility is the single biggest gotcha. The full-size AMS uses the P1/X1 control protocol and physical mounting points, neither of which exist on the A1 series. Bambu sells a separate product called the AMS Lite for the A1 — it has 4 external spool holders mounted on top of the printer rather than the enclosed cabinet design. New buyers regularly order the wrong unit because the names sound similar. Always verify your printer model against Bambu's compatibility chart before ordering.
Daisy-chaining adds setup complexity. Each AMS unit needs its own power supply and the AMS hub adds another. Cable routing for 4 AMS units plus a printer becomes a significant desk-space problem — plan for a side table or rack mount. For most users, a single 4-spool AMS handles 95% of multi-color prints, and the marginal value of slots 5-16 is small unless you specifically print products needing dozens of distinct colors.
RFID Auto-Detection and Material Support
Bambu's RFID-tagged filament spools include a small NFC chip on the spool side that the AMS reads when the spool is loaded. Bambu Studio receives the brand, material, color, recommended nozzle temperature, recommended bed temperature, and dry-storage settings automatically — no manual filament selection. This is a significant quality-of-life feature: load 4 different Bambu spools and the slicer prefills profiles for each. Print success rates on first attempts climb meaningfully because temperature and flow settings come from Bambu's tested profiles instead of defaults.
Third-party filament works mechanically (the AMS doesn't reject non-Bambu spools) but loses RFID auto-detection. You manually enter material type and color in Bambu Studio when loading. Most users mix Bambu rolls (for the prints they care about) with cheaper third-party rolls (for prototypes and supports). The AMS is brand-agnostic on the hardware level, so this works fine.
Material compatibility is broad: PLA, PETG, ABS, ASA, TPU 95A+, PVA, and PA-CF (carbon-fiber-reinforced nylon) all feed reliably. The AMS's enclosed cabinet helps with abrasive materials — PA-CF and glass-filled PETG dust stays contained instead of coating your desk. Soft TPU below 95A shore hardness is the main exclusion: the AMS uses bowden tubes with sharp turns, and very flexible filaments compress and jam in the path. For soft TPU, run from a direct top-spool holder bypassing the AMS.
Purge Waste, Print Time, and Multi-Color Economics
Every color swap in a multi-material print purges the previous color out of the hotend before the new color flows. The Bambu AMS purges 100-150mm³ per swap, equivalent to about 1-2g of filament depending on material density. Bambu Studio shows the cumulative purge weight in the slicing summary so you see the cost upfront. A 4-color print with 50 swaps wastes roughly 50-100g of filament — about $1.50 in material at typical PLA pricing. A 16-color print with hundreds of swaps wastes 200-400g, which materially affects the economics of multi-color work.
Bambu Studio offers strategies to minimize purge: "flush into infill" pumps purge filament into model infill regions, and "flush into objects" creates dedicated purge towers. Both reduce waste at the cost of longer print times and slightly weaker parts (purge-filled infill is layered with the wrong color, which is invisible in the final part but slightly affects mechanical properties). For aesthetic prints where you don't see the infill, this is the right strategy.
Print time impact is significant. A 4-color print takes roughly 1.3-1.5x as long as the equivalent single-color print due to color-swap pauses, purges, and the AMS's filament handling. A print that takes 6 hours single-color stretches to 8-9 hours multi-color. For overnight prints this is invisible; for time-sensitive jobs, factor it in. The AMS makes hands-off multi-color possible, but the throughput cost is real — if you print 100+ items per week, dedicated single-color printers are more efficient than multi-color via AMS.
Common Gotchas
The A1 incompatibility is the most expensive mistake. People buy the full-size AMS expecting it to work with their A1, then have to return or resell it. Read your printer model carefully. P1S and P1P use the AMS. X1C and X1E use the AMS. A1 and A1 Mini use the AMS Lite, sold separately at $349. There is no firmware update or adapter that bridges this — the protocols are different.
Purge waste sneaks up on you. A 16-color print can waste 300+ grams of filament in purges, which is a full kilogram spool every 3-4 large prints. Bambu Studio shows the purge weight in the slicing summary; check this number before printing or you will be surprised by the filament budget. Use "flush into infill" and minimize unnecessary color changes to reduce waste.
TPU under 95A shore hardness does not feed reliably. The AMS's bowden tubes and tight bends compress soft TPU until it jams. If you print a lot of flexible TPU, plan to bypass the AMS — mount a top spool holder on the printer and feed direct. Bambu sells an external spool holder for this purpose ($30).
The humidity sensor only reads inside the AMS chamber. It does not measure your dry box or shelf storage. Spools that sit on a shelf for 6+ months can accumulate moisture before you load them — the AMS's desiccant won't fix already-wet filament. Use a separate filament dryer (such as the SUNLU FilaDryer S2) to dry spools before loading into the AMS.
Third-party spools work mechanically but lose RFID auto-detection. They also lose Bambu's failure-recovery features that depend on knowing the spool weight. If a print pauses for an out-of-filament condition, third-party spools require manual continuation; Bambu spools resume automatically.
Full Specifications
I/O & Interfaces
| Specification | Value |
|---|---|
| connection | Direct cable to printer |
Power
| Specification | Value |
|---|---|
| Input Voltage | 24V from printer |
Physical
| Specification | Value |
|---|---|
| capacity | 4 spools (250g-1kg each) |
| Dimensions | 368 x 245 x 158 mm |
| weight_g | 3500 g |
Who Should Buy This
AMS handles 4 colors per unit, 16 colors with daisy-chaining. RFID auto-detection means swapping spools is plug-and-play. Bambu Studio's color slicing handles complex gradients and decals automatically.
PVA and BVOH support materials feed reliably through the AMS, enabling clean overhangs on PLA and PETG models. The desiccant compartment is critical — dissolvable supports absorb moisture quickly and fail without dry storage.
The A1 series uses an entirely different multi-material system called the AMS Lite. The full-size AMS does NOT physically or electrically connect to the A1 — you need the AMS Lite (sold separately).
Better alternative: bambu-lab-ams-lite
AMS adds cost, purge waste (1-2g per swap), and complexity. Running multiple printers, one per color, eliminates purge waste and increases throughput. Better economics at any volume.
The original AMS has a desiccant compartment but no active heater. The newer AMS 2 Pro adds active heated drying up to 65°C. If active drying matters more than the $80 price difference, the AMS 2 Pro is the right pick.
Better alternative: bambu-lab-ams-2-pro
TPU 95A and harder feeds reliably. Softer TPU (85A, 90A) is a coin flip — the AMS's bowden tubes and tight bends cause feeding issues with very flexible filaments. Direct-feed from a top spool holder is more reliable for soft TPU.
Ecosystem & Community
The AMS sits at the center of Bambu's multi-color ecosystem. MakerWorld hosts 100K+ multi-color models pre-configured for AMS slot assignments, and Bambu Studio's color slicing is the most refined in consumer 3D printing.
Compatible Software
What to Build First
Print a tabletop miniature using 3 colors of PLA for the model and PVA in the fourth slot for dissolvable supports. The PVA dissolves in water leaving clean overhangs that no single-material print can match — the killer use case that justifies the AMS for many hobbyists.
View tutorial →Must-Have Accessories
Video Reviews & Tutorials
Tutorials & Resources
- Bambu AMS Official WikiSetup, calibration, and material profile reference for the AMSdocs
- Bambu StudioOpen-source slicer with full AMS support including flush-into-infill optimizationgithub
- MakerWorld Multi-Color Models100K+ pre-sliced multi-color models with AMS slot assignments preconfiguredproject
Frequently Asked Questions
Does the Bambu AMS work with the A1 or A1 Mini?
No. The A1 series requires a different product called the AMS Lite, which has external spool holders rather than the enclosed cabinet design. The full-size AMS only works with P1S, P1P, X1C, and X1E. There is no adapter or firmware that bridges the two.
How much filament does the AMS waste per color change?
Each color swap purges 100-150mm³ of filament, roughly 1-2g per swap depending on material density. A 4-color print with 50 color swaps wastes 50-100g of filament. Use Bambu Studio's "flush into infill" option to recapture purge into invisible model regions.
Can I daisy-chain multiple AMS units?
Yes. Up to 4 AMS units chain together via AMS Hubs for a maximum of 16 colors per print. Each additional unit costs $249 plus a $20 hub. Most users find a single 4-spool AMS handles 95% of multi-color prints; the marginal value of more slots drops quickly.
Does the AMS work with non-Bambu filament?
Yes. Third-party spools fit and feed mechanically. They lose RFID auto-detection (you manually set material and color in Bambu Studio) and certain failure-recovery features. Most users mix Bambu rolls for the prints that matter and cheaper third-party rolls for prototypes.
Can the AMS dry filament during printing?
The original AMS has a desiccant compartment but no active heater — it maintains dry filament rather than drying wet filament. The newer AMS 2 Pro adds active heated drying up to 65°C. For drying wet spools before printing, use a separate dryer like the SUNLU FilaDryer S2.
What materials are not recommended for the AMS?
TPU below 95A shore hardness, very abrasive carbon-fiber materials at high feed rates, and any filament with a diameter inconsistency outside 1.75mm ± 0.05mm. Soft TPU jams in the bowden path; abrasive materials wear the AMS's PTFE faster but still work.
Is the AMS worth it for 2-color prints?
It depends on volume. For occasional 2-color prints, manual filament swaps (Bambu Studio supports prompted color changes) work fine and cost nothing. For frequent 2-color work, the AMS automation is worth the $249 — it eliminates the swap-attendance time and enables overnight multi-color printing.