How to Dry Bambu Lab Filament: AMS 2 Pro, AMS HT, Heatbed or Oven

Dry filament with the method that reaches the temperature your material needs. The AMS 2 Pro tops out at 65 °C, which covers PLA and PETG. The AMS HT reaches 85 °C, which covers ABS, ASA, PC, nylon, PET-CF and TPU. PPS-CF and PPA-CF need a forced-air oven at 100 °C or more. Bambu's official temperatures and times for each material are in the table below.

In this guide

• Why dry filament at all
• The four methods compared
• Official settings by material
• Drying in an AMS 2 Pro or AMS HT
• Drying on the heatbed
• Storing dry filament
• FAQ

Why dry filament at all

Filament absorbs moisture from the air. In the hot nozzle that moisture vaporizes, which makes the molten plastic expand and extrude erratically. The result is stringing, oozing, bubbles, rough surfaces and weaker parts, and it gets worse with humidity and with time out of the bag. Bambu recommends drying before important prints when the storage history is uncertain, and keeping spools sealed between jobs.

The four methods compared

Official settings by material

These are the recommended parameters from Bambu's drying guide. Heatbed times assume an enclosed printer with a cover over the spool.

Drying in an AMS 2 Pro or AMS HT

1. Close the AMS lid and open the printer's "Drying & Humidity" page, or the Dry button on the AMS in Bambu Studio or Bambu Handy. Pick the right AMS if you have several.
2. Remove anything with a lower softening point. Drying ABS or PETG exceeds the softening temperature of PLA and TPU, so take every PLA and TPU spool out of an AMS 2 Pro first. Drying PLA is the exception: other filaments can stay.
3. Choose rotating-spool drying where you can. Withdraw the filament from the feeder, stow it on the spool and tick "Rotate spool while drying". The spool turns 30° every 5 minutes for even heating. Static drying, with the filament left in the inlet, does not suit PLA, PVA, PLA/PETG supports or TPU, because they soften and can stick or deform. From H2D firmware 01.03.00.00, PLA and TPU can be dried without rewinding.
4. Select material and start. Bambu filament with RFID tags sets time and temperature automatically.

Power. On the H2 Series, P2S and X2D one AMS 2 Pro can run drying from the printer. Extra units need the Switching Adapter (24 V, 4 A, official part only). On X1, P1 and A2L printers every AMS 2 Pro needs its own adapter. Without it the H2 Series dries at 86% power, and a P2S or X2D cannot heat, move or load while drying. The AMS HT always uses its own cord.

Drying while printing. Needs recent firmware and is currently supported on the H2D (01.03.00.00 or newer), H2S and P2S (01.02.00.00), X2D and A2L (01.01.00.00). The AMS lowers the temperature automatically so it does not soften the spool being printed: 45 °C when drying PETG while printing PLA, and 55 °C when drying ABS while printing PETG. P1P, P1S, X1C, A1 and A1 Mini do not support it yet. Using the AMS HT through its TPU outlet counts as plain drying and works on any model.

Drying on the heatbed

1. Unload the filament from the toolhead and clear the area above and below the plate.
2. Lower the bed (H2, X and P2S printers have a "Prepare" step; the P1S needs manual homing and lowering).
3. Place the spool on the plate and cover it with a lid printed in a high-temperature material such as PA-CF or PC, or with the filament's packaging box. Bambu publishes a Filament Drying Cover model.
4. Set the bed temperature and time from the table and start. Flip the spool halfway, wearing gloves.
5. When done, set the bed to 0 °C, let the spool cool until it is not hot to the touch, and seal it right away.

Some third-party spools are not heat resistant and can deform, so check before you use this method. On the P1S there is no built-in drying feature: you track the time yourself.

Storing dry filament

Drying only lasts while the spool stays dry. Bambu advises sealing moisture-sensitive filament in a container or the AMS with effective desiccant straight after drying and using it soon. Required-drying materials (TPU, PC, nylon, PVA, PET-CF) are the ones to protect first. We carry rechargeable spool desiccant and vacuum storage bags in the filament accessories collection.

FAQ

Do I need to dry new Bambu filament?

Bambu recommends drying PLA, PETG and ABS/ASA before important prints when you are unsure how it was stored, and lists it as required for TPU, PC, nylon, PET-CF, PPS-CF and PVA.

Can the AMS 2 Pro dry nylon or PET-CF?

No. Bambu lists those materials as not compatible with the AMS 2 Pro, whose limit is 65 °C. Use an AMS HT, a heatbed or a forced-air oven.

Can I dry filament in a kitchen oven or microwave?

No. Bambu specifies a forced-air oven because a kitchen oven or microwave can damage the filament and the spool.

Why does the AMS ask me to remove PLA before drying PETG?

PETG drying temperatures are above PLA's softening point. Leaving PLA in the AMS can soften and deform it.

Can I dry on an A1, A1 Mini, P1P or A2L heatbed?

No. Bambu says open-frame printers cannot be used to dry filament that way. Use an AMS HT or an oven.

Which method is best for TPU?

The AMS HT at 75 °C for 18 hours, or the heatbed. Bambu notes that the AMS 2 Pro may not fully dry TPU.

Sources

• Bambu Lab Wiki, Filament Drying: methods, power rules, Appendix I parameters.
• Bambu Lab Wiki, Filament drying guide for AMS 2 Pro and AMS HT: workflow, firmware, power adapters, drying while printing.