Which filaments work in a Bambu Lab AMS

Every Bambu Lab AMS (Automatic Material System) feeds PLA, PETG, dry PVA and BVOH, support filament and Bambu’s TPU for AMS. The AMS, AMS 2 Pro and AMS HT also take ABS, ASA, PC and Bambu’s own PAHT-CF and PETG-CF. No AMS loads soft TPU, damp PVA or most third-party carbon- or glass-fiber filaments automatically; the AMS HT can hold the TPU and fiber filaments while you feed them by hand through its bypass outlet.

Which filaments work in a Bambu Lab AMS?

Bambu Lab’s AMS, AMS 2 Pro and AMS HT feed PLA, PETG, ABS, ASA, PC, PA (nylon), PET, PP, POM, HIPS, dry PVA and BVOH, TPU for AMS and Bambu’s PLA-CF, PETG-CF and PAHT-CF. Soft TPU, damp PVA and other brands’ carbon- or glass-fiber filaments are unsupported. The AMS lite drops ABS, ASA, PC and most fiber-filled grades.

Bambu Lab sells four models. The original AMS and the AMS 2 Pro hold four spools each, and the 2 Pro adds a 65 °C dryer. The AMS HT holds one spool and dries at up to 85 °C. The four-spool AMS lite works only with the A series.

The table gives Bambu Lab’s rating for each filament on each model, from its filament guide, the AMS specifications and the filament’s product page. Rows run from PLA to engineering filaments. “Bypass, by hand” means the AMS HT holds the spool, but you push the filament through its separate rear outlet by hand, with no automatic loading or retraction.

Filament	AMS	AMS 2 Pro	AMS HT	AMS lite	Bambu Lab’s note
PLA Basic, Matte, Silk, Marble, Sparkle	Yes	Yes	Yes	Yes	Product pages: “All AMS Series Compatible”
PLA Wood	Yes	Not stated	Not stated	Yes (see below)	Product page names only the AMS and AMS lite
PLA Glow	Yes, faster wear	Yes, faster wear	Yes, faster wear	No	Abrasive; hardened steel nozzle required
Bambu PLA-CF	Yes	Yes	Yes	Yes	Bambu’s CF grades are tuned for the AMS
Other brands’ PLA-CF/GF, PETG-CF, PA-CF/GF, PET-CF	No	No	Bypass, by hand	No	Too brittle or abrasive for the feed path
PVA, BVOH (dry)	Yes	Yes	Yes	Yes	Must be dried first
PVA, BVOH (damp)	No	No	No	No	Too soft to pass the feed channel
Support for PLA/PETG, Support for PLA	Yes	Yes	Yes	Yes	Support interfaces only
PETG, PETG HF, PETG Translucent	Yes	Yes	Yes	Yes	PETG HF and Translucent must be dried
Bambu PETG-CF	Yes	Yes	Yes	No	AMS lite lacks the AMS’s extra transmission gear
TPU for AMS (68D)	Yes	Yes	Yes	Yes	Dry before use
TPU 95A HF, 90A, 85A	No	No	Bypass, by hand	No	Too soft for automatic feeding
TPE	No	No	Bypass, by hand	No	Too soft for automatic feeding
ABS, ASA, PC	Yes	Yes	Yes	No	Enclosed printer required
Bambu ABS-GF, ASA-CF	Yes	Yes	Yes	No	Enclosed printer required
Bambu PAHT-CF, PA6-GF	Yes	Yes	Yes	No	Dry first; enclosed printer recommended
Bambu PA6-CF, PET-CF, PPA-CF, PPS-CF	No	No	No (PET-CF: bypass, by hand)	No	“All AMS Series NOT Compatible”
PP, POM, HIPS	Yes	Yes	Yes	Yes	Listed in every AMS specification

Bambu Lab’s own pages disagree on four entries. Where they do, the table follows the filament’s product page:

• ASA and PC on the AMS lite. The AMS lite specification lists both as filaments it can load and unload, but adds that printer compatibility is a separate question. The ABS, ASA and PC product pages mark the AMS lite as not compatible and require an enclosed printer. The A1 and A2 series printers it connects to are open-frame.
• PETG-CF on the AMS lite. The AMS lite FAQ calls Bambu PETG-CF compatible. The AMS lite specification and the filament guide say not recommended, and the PETG-CF product page says not compatible.
• PLA Wood on the AMS lite. The PLA Wood product page lists the AMS lite as compatible. The filament guide names PLA Wood as too brittle and says it is compatible with the AMS but not recommended for the AMS lite.
• PLA Glow. The filament guide lists PLA Glow as not recommended for the AMS and AMS lite. The PLA Glow product page lists the AMS, AMS 2 Pro and AMS HT as compatible “but can lead to faster wear”, and the AMS lite as not compatible.

Why does an AMS reject some filaments?

Bambu Lab’s filament guide names three kinds of filament that do not suit the AMS feed path:

• Too soft. TPU 95A, 85A, 83A and 80A, and damp PVA or BVOH, “cannot pass smoothly” through the channel. They cause loading and unloading failures and clogs.
• Too brittle. Some brands of PET-CF, PLA Wood, PA-CF/GF and PAHT-CF/GF “can easily break inside” the channel.
• Too hard and rough. Some brands of PET-CF, PA-CF/GF, PAHT-CF/GF and PLA-CF/GF wear down the internal feed channel.

The AMS has an extra transmission gear that works with the extruder gear to push against feed resistance, so it copes with some softer or rougher filaments. The AMS lite has no such gear, so the filament guide does not recommend PETG-CF or PLA Wood with the AMS lite.

Bambu Lab says its own PLA-CF, PETG-CF and PAHT-CF are “specially optimized” for the AMS. Its compatibility ratings cover loading and unloading only. A rough filament can load fine at first, and Bambu Lab warns that carbon fiber or glow filaments “can eventually grind down the internal PTFE feed channels”.

The PTFE tubes are replaceable consumables, so check them for wear during maintenance. Worn tubes lead to feeding failures and filament piling up inside the AMS. Glow and fiber-filled filaments also need a hardened steel nozzle; when to use a hardened steel nozzle covers which ones.

Use the spool holder on the back of the printer for any filament the AMS cannot take. On an X1, unload the AMS filament, release the PTFE tube at the printer, load the new filament from the spool holder and untick “Enable AMS” when you send the print.

Which AMS works with which Bambu Lab printer?

The AMS, AMS 2 Pro and AMS HT are sold in versions for the A1 series, A2L, H2D, H2C, H2S, P2S, X1 and P1 series, and X2D. Each version comes with or needs the hub, buffer or adapters that printer uses.

The AMS lite works only with the A1 and A2 series, one unit per printer. On an A1, the AMS lite cannot be combined with other AMS models; the A2L takes up to four AMS units and one AMS lite at once. The AMS lite on an A1 mini covers that pairing. On a dual-nozzle H2D, each AMS feeds one nozzle, as the H2D dual nozzle page explains.

What spool sizes fit in an AMS?

Model	Spool width	Spool diameter	Filament diameter
AMS, AMS 2 Pro, AMS HT	50 to 68 mm	197 to 202 mm outside	1.75 mm
AMS lite	40 to 68 mm	53 to 58 mm center hole	1.75 mm

The AMS lite grips the spool at its center hole with a spring-loaded holder, which Bambu Lab says improves compatibility “especially for those paper spools”. For the other models, Bambu Lab recommends plastic spools that fit correctly. With cardboard spools it “strongly” advises a spool adapter or adapter ring “to reduce the risk of slippage and debris getting left behind in the AMS”. Bambu Lab’s refills can be fitted onto its reusable plastic spool instead.

Spools outside these sizes print from the spool holder; Bambu Lab’s X1 guide says the AMS does not support “some larger size spools”.

Can the AMS dry moisture-sensitive filament?

Only the AMS 2 Pro and AMS HT can; the original AMS and the AMS lite have no heater. The AMS 2 Pro reaches 65 °C, but only when the room is at 25 °C or warmer. The AMS HT reaches 85 °C and, with its 170 W heater, holds it in a room at 10 to 25 °C.

The table’s figures come from the parameter table in Bambu Lab’s filament drying recommendations, sorted here by AMS HT temperature. “Not compatible” refers to drying only: the AMS 2 Pro still feeds ABS, ASA and PC, but Bambu Lab gives no AMS 2 Pro drying setting for them.

Filament	AMS 2 Pro	AMS HT
PLA Basic, Matte, Silk, Wood, PLA-CF	45 °C, 12 h	45 °C, 12 h
Support for PLA, Support for PLA/PETG	60 °C, 12 h	60 °C, 12 h
PETG, PETG-CF	65 °C, 12 h	65 °C, 12 h
TPU 85A, 90A, 95A HF, TPU for AMS	65 °C, 12 h (may not dry fully)	75 °C, 18 h
ABS, ASA, ABS-GF, ASA-CF, PC	Not compatible	80 °C, 8 h
PET-CF	Not compatible	80 °C, 12 h
PA6-CF/GF, PAHT-CF/GF	Not compatible	85 °C, 12 h
PVA	Not compatible	85 °C, 18 h
PPA-CF, PPS-CF	Not compatible	Not compatible

Bambu Lab’s pages disagree on two drying points. The filament guide gives 75 °C for 12 h for TPU in the AMS HT, against 18 h in the drying table, and calls the AMS 2 Pro not recommended for drying TPU. The drying table marks PPA-CF and PPS-CF not compatible with the AMS HT, while the same page says the AMS HT can dry every filament but may not fully dry PVA, PPS-CF or PPA-CF. For PPA-CF and PPS-CF, Bambu Lab lists 100 to 140 °C in a forced-air oven for 8 to 12 h.

Before you start a drying cycle:

• Take out PLA and TPU before drying ABS or PETG. Those temperatures exceed the softening point of PLA and TPU, so both can deform. When you dry PLA, other filaments can stay in the AMS.
• Pull PLA, PVA, Support for PLA/PETG and TPU back onto the spool and tick “Rotate spool while drying”. Static drying can make their layers stick together or deform. The rotating mode turns the spool 30° every 5 minutes. On the H2D, firmware 01.03.00.00 and later can dry PLA and TPU without rewinding.
• Set the filament type. A spool with no RFID data shows “?” and dries on PLA settings until you set its type.
• Weigh down TPU spools. Bambu Lab says a TPU spool can swell from 65.4 mm to about 69.4 mm wide while drying, past the 68 mm maximum width in the AMS specifications. Put a heat-resistant weight on the spool.
• Connect power. The AMS HT always needs its own power cord to dry. One AMS 2 Pro can dry on printer power from an H2 series, P2S or X2D printer. Without the adapter, a P2S or X2D cannot heat the bed or hotend, move its axes or load filament while the AMS dries. On X1, P1 and A2L printers, every AMS 2 Pro needs its own adapter.

While printing, the AMS lowers its drying temperature to 45 °C if the job uses PLA and to 55 °C if it uses PETG, so the filament it feeds does not soften. Drying while printing needs firmware 01.03.00.00 on the H2D, 01.02.00.00 on the H2S and P2S, and 01.01.00.00 on the X2D and A2L. The P1S, P1P, X1C, A1 and A1 mini do not support it yet.

Can you put TPU in an AMS?

Only hard TPU feeds automatically. Bambu Lab’s TPU for AMS, a 68D grade, works in the AMS, AMS 2 Pro, AMS HT and AMS lite. TPU 95A HF, 90A and 85A are not compatible with the AMS, AMS 2 Pro or AMS lite. The AMS HT keeps them dry while you hand-feed them through its TPU outlet.

Bambu Lab’s TPU grades, sorted by Shore hardness from hardest to softest:

TPU grade	Shore hardness	AMS, AMS 2 Pro, AMS lite	AMS HT	Printer limits
TPU for AMS	68D	Feeds automatically	Feeds automatically	Not with a 0.2 mm nozzle
TPU 95A HF	95A	Not compatible	Dry box, fed by hand through the TPU outlet	Not with a 0.2 mm nozzle
TPU 90A	90A	Not compatible	Dry box, fed by hand through the TPU outlet	Not with a 0.2 mm nozzle
TPU 85A	85A	Not compatible	Dry box, fed by hand through the TPU outlet	0.6 or 0.8 mm nozzle or a TPU high-flow hotend; not on the A1 series; right nozzle only on the H2D and H2C

The TPU 95A HF product page says “All AMS Series NOT Compatible”, while Bambu Lab’s TPU guides list the AMS HT as compatible. In practice they agree: no AMS feeds 95A HF automatically, and the AMS HT can only serve as its sealed container. On H2 series printers, TPU 85A cannot run through a PTFE tube at all and goes straight into the extruder.

For other brands’ TPU, Bambu Lab’s AMS lite FAQ draws the line by hardness: 77D, 55D or harder can go through the AMS lite, and 95A, 85A, 83A, 80A or softer cannot. The AMS 2 Pro specification lists generic TPU as not supported, and the AMS HT lists it for the bypass outlet only. Bambu Lab printers do not support TPU softer than 85A.

How do you print soft TPU on a printer with an AMS?

Feed it outside the AMS’s automatic path, one of three ways:

• From the spool holder or a dry box. Bambu Lab’s TPU guide points to an AMS HT or a sealed filament dry box as the container. Raise the container so the bed and nozzle do not catch the slack filament. On an X1, untick “Enable AMS” when you send the print.
• From the AMS HT’s TPU outlet. Cut a 50 mm PTFE tube and bend it slightly. Remove the silicone plug at the back of the AMS HT. Insert the tube with the curve facing up so about 5 mm sits inside, then feed the filament up through it and close the lid. Push the filament by hand through the PTFE tube to the extruder. The AMS HT cannot load or retract that spool, but it can keep drying it during the print on any printer model.
• With the TPU Feed Assist Module. This Bambu Lab add-on extruder fits the H2S, H2D, H2D Pro, H2C, X1, X1C, X1E, X2D, P1P, P1S and P2S, and handles TPU from 85A to 95A HF. It feeds from an external spool holder or the AMS HT’s TPU outlet, not through AMS automatic loading, and you print its shell and frame yourself.

Turn off flow dynamics calibration before a TPU print, as Bambu Lab’s TPU guide instructs. Dry the TPU first, and store it sealed below 20% relative humidity. On a dual-nozzle H2D or H2C, TPU can run on the right nozzle while the left prints rigid filament from an AMS; combining TPU and PETG in one print covers that setup.