Bambu AMS vs AMS 2 Pro 2026: Is Active Drying Worth $100 More?
The original Bambu AMS ($249) handles 4 spools with passive desiccant drying. The AMS 2 Pro ($349) adds a PTC heater that dries filament continuously at 30-65°C — the upgrade is worth $100 more if you print PETG, nylon, or TPU regularly. PLA-only printers in dry climates should stick with the original AMS.
Head-to-Head Comparison
| Category | Winner | Why |
|---|---|---|
| Drying Capability | Bambu Lab AMS 2 Pro | The AMS 2 Pro has built-in active drying — PTC heater plus circulation fan keeps the chamber at 30-65°C with dual humidity sensors. The original AMS has passive desiccant only, which saturates within weeks in humid climates. For PETG, nylon, TPU, or PA-CF, this difference is the entire reason the AMS 2 Pro exists. |
| Purge Waste | Bambu Lab AMS 2 Pro | The AMS 2 Pro's redesigned cutter produces 80-120mm³ of purge waste per color change vs the original AMS's 100-150mm³ — a 20-30% reduction. On a 200-color-change cosplay print, that saves 4-6g of filament. Small per-print but adds up over hundreds of multi-color prints per year. |
| Capacity & Daisy-Chaining | tie | Both AMS versions hold 4 spools (250g-1kg each) and daisy-chain up to 4 units for 16 colors. They're cross-compatible — you can mix AMS 2 Pro and original AMS in the same chain. Capacity is identical; the AMS 2 Pro doesn't sacrifice anything to add active drying. |
| Desiccant Maintenance | Bambu Lab AMS 2 Pro | The AMS 2 Pro uses regenerable desiccant — bake it in an oven at 120°C for 2 hours and reuse indefinitely. The original AMS uses replaceable silica packets ($15-20/year in supplies). Over 3 years, the AMS 2 Pro saves $45-60 in desiccant alone, not counting the convenience of never running out. |
| Compatibility | tie | Both work with P1S, P1P, X1C, and X1E. Neither works with the A1 series — A1 owners need AMS Lite (passive) or AMS HT (active drying for A1). The AMS 2 Pro adds H2D support which the original AMS doesn't have, but both versions cover the most popular Bambu printers identically. |
| Price & Value | Bambu Lab AMS | At $249, the original AMS is $100 cheaper than the AMS 2 Pro ($349). For PLA-only users in dry climates, that $100 buys nothing — PLA is barely hygroscopic and the original AMS handles it perfectly. The premium is only justified if you actually print materials that need active drying. |
Which Board for Your Project?
| Use Case | Recommended | Why |
|---|---|---|
| PLA-only printing in a dry climate | PLA absorbs moisture slowly and stays printable for months without active drying. The original AMS at $249 is enough — save the $100 for filament or another upgrade. | |
| Regular PETG, nylon, or TPU printing | These materials absorb moisture within days in humid climates. Active drying eliminates the need to swap spools to a separate filament dryer between prints — that workflow alone justifies the upgrade. | |
| Multi-color cosplay or art print farm | The 20-30% reduced purge waste pays back over hundreds of color changes per week. Combined with active drying for material flexibility, the AMS 2 Pro wins for any high-volume multi-material workflow. | |
| Already own original AMS, want active drying | Don't replace — ADD an AMS 2 Pro. Daisy-chain it with your existing AMS and route hygroscopic filaments (PETG, nylon, TPU) through the AMS 2 Pro while keeping PLA in the original. You get 8 colors with material-appropriate handling. | |
| Bambu A1 or A1 Mini owner | Neither AMS version is compatible with A1 series. Buy the AMS Lite ($149, passive 4-spool) or AMS HT (active drying for A1, ~$249) instead — the AMS 2 Pro physically does not connect to A1 printers. | |
| Climate-controlled workshop with low humidity | If your workshop is dehumidified to < 40% RH year-round, even hygroscopic filaments stay printable longer than they would in typical home conditions. The active drying is less impactful here. Save the $100. |
Where to Buy
Final Verdict
Buy the AMS 2 Pro if you regularly print PETG, nylon, TPU, or PA-CF — the active drying eliminates a separate filament dryer and keeps print quality consistent. Buy the original AMS if you only print PLA in a dry climate or your budget is tight. If you already own one or two original AMSes, ADD an AMS 2 Pro for material-specific routing rather than replacing existing units.
Frequently Asked Questions
Is the AMS 2 Pro worth $100 more than the original AMS?
Yes if you print PETG, nylon, or TPU regularly — the active drying replaces a separate filament dryer ($45 SUNLU S2) and a year of replacement desiccant ($15-20). Net cost over 2 years is roughly the same as the original AMS plus accessories. No if you only print PLA in a dry climate.
Can I daisy-chain an AMS 2 Pro with my existing original AMS?
Yes — both versions use the same connection protocol. Up to 4 AMS units of any mix can daisy-chain on a single P1S/X1C for 16 colors total. The Bambu Studio slicer routes color changes through the appropriate AMS based on material assignments.
What temperatures does the AMS 2 Pro support for drying?
30-65°C continuous. Recommended profiles: PETG 55°C, TPU 50°C, nylon 60-65°C, PA-CF 65°C, PLA 45°C (rarely needed). The 65°C max is enough for all Bambu-supported filaments. PEEK and ULTEM need 80°C+ but aren't supported by Bambu printers.
Does the AMS 2 Pro reduce purge waste significantly?
About 20-30% — 80-120mm³ per color change vs 100-150mm³ on the original AMS. Per print, savings are small. Over a year of multi-color printing (hundreds of color changes per week), the cumulative savings can total 200-500g of filament.
Will the AMS 2 Pro work with my Bambu A1 Mini?
No. The AMS 2 Pro is only compatible with P1S, P1P, X1C, X1E, and H2D. A1 series printers use the AMS Lite (4-spool passive, $149) or AMS HT (active drying for A1, ~$249). The connector and protocol are different.
How much does active drying add to my electricity bill?
60W max during drying, automatic duty-cycling when idle. Continuous drying at 50°C uses about 4-6 kWh/month per unit — roughly $0.65-1.00 at average US electricity rates. Negligible compared to the cost of ruined PETG prints from wet filament.
Can I use third-party filament with the AMS 2 Pro?
Yes. Active drying works on any 1.75mm spool that fits the chamber (250g-1kg). You lose Bambu's RFID auto-detection on third-party spools — just set the filament type manually in Bambu Studio.