AMS 2 Pro vs Original AMS: What Actually Changes, From Bambu’s Own Specs
The AMS 2 Pro adds a heater that dries up to 65 °C, spool rotation during drying and a faster feeding motor. The original AMS relies on a sealed enclosure with desiccant and a humidity sensor. Both hold four spools. On X1 and P1 printers the AMS 2 Pro needs extra accessories, and drying needs the adapter. Last checked October 25, 2026.
This is a researched comparison using Bambu Lab’s published pages as of October 25, 2026. I have not used both units side by side, so treat the table as Bambu’s claims, not test results. Prices change by region, so check the store.
Side-by-side
| Original AMS | AMS 2 Pro | |
|---|---|---|
| Spool slots | 4 | 4 |
| Chaining | Up to 4 units (16 colors) with an AMS Hub | Up to 4 AMS 2 Pro and 8 AMS HT, 24 filaments total |
| Drying | Sealed enclosure, desiccant and humidity sensor (the sensor warns when humidity is high or desiccant may need replacing) | Heater up to 65 °C, electro-magnetic air vent, spools rotate during drying |
| Filament settings | Manual | RFID sets drying settings for official Bambu filament |
| Feeding | Not stated as brushless | Brushless motor; Bambu says up to 60% faster feeding |
| Size and weight | 368 x 283 x 224 mm, 2.5 kg | 372 x 280 x 226 mm, 2.5 kg |
| Power | Printer bus power | Printer bus power for feeding; adapter needed for drying on X1/P1 |
What the AMS 2 Pro needs on X1 and P1
Bambu says the AMS 2 Pro works with its printers, but X1 and P1 owners need accessories: a filament buffer or AMS Hub, bus cables, PTFE parts and, for drying, the Switching Adapter. Upgrade Kit 1 covers the parts for one unit (see the P1S installation guide). The drying feature also needed a firmware update on those printers.
Limits to know
- Drying tops out at 65 °C. Bambu says some filaments need more and recommends the AMS HT for those.
- Drying while printing depends on the printer and whether the unit is part of the print. See the AMS 2 Pro drying guide for the details.
- Each AMS 2 Pro that dries on an X1 or P1 needs its own adapter (see the power adapter guide).
Questions to ask before you buy
- Do you need active drying, or is a sealed enclosure with desiccant enough for your filament and climate?
- Which printer do you own? The accessories and power rules differ, and they affect the total cost.
- How many units will you dry at once? That sets how many adapters you need.
- Do you print filaments that need more than 65 °C? If so, ask whether an AMS HT fits better.
- Will you mix both? Bambu’s CA store says you can use both an AMS and an AMS 2 Pro on one H2D.
I have left out any verdict like “worth it” because that depends on your printer, filament and budget.