Why Bambu Printers Change the Filament Equation
Bambu Lab printers — specifically the X1C and P1S — operate at a fundamentally different level than most desktop FDM machines. Multi-color AMS, active vibration compensation, a 300°C capable hotend, and print speeds up to 500mm/s mean that filament choice and settings matter in ways they simply do not on a slower printer. This guide covers what actually works, what to watch out for, and how to get the best results from each material type.
The Best Filaments for Bambu X1C and P1S
Filora High Speed PLA
Formulated for 200–600mm/s — built for Bambu X1C and P1S
High Speed PLA — The Obvious First Choice
Standard PLA tops out around 100–150mm/s on most printers before underextrusion sets in. On a Bambu X1C, that is leaving most of the machine on the table. High Speed PLA is reformulated with lower viscosity to enable full volumetric flow at 300–600mm/s without starving the hotend.
Recommended settings on X1C/P1S: 210–220°C nozzle, 35–55°C bed, flow rate calibration on first use. Use the Bambu high-speed PLA profile as a baseline and adjust from there. AMS compatible — runs reliably through all four channels.
Standard PLA and PLA+
Bambu's standard PLA profile (210°C, 60°C bed) works well with quality PLA in the 200–300mm/s range. PLA+ runs the same settings but delivers better layer adhesion and impact resistance. Both are AMS compatible. For most users printing prototypes, models, and functional household items, PLA or PLA+ at 250–350mm/s hits the sweet spot of speed and quality.
PETG on Bambu Printers
PETG on the X1C and P1S requires a few adjustments. Because PETG strings easily, the Bambu default profile runs a purge tower aggressively in multi-color setups. For single-material PETG runs, disable the purge tower and dial retraction to 0.8–1.2mm. Settings: 240–250°C nozzle, 70–80°C bed, 150–200mm/s for quality work.
Filora PLA Carbon Fiber
Lightweight and stiff — perfect for structural Bambu prints
PETG in AMS: technically compatible, but moisture sensitivity means wet PETG clogs the AMS hub. Always use dry PETG, and consider a dry box feed if your workshop is humid.
ABS and ASA — Enclosure Advantage
This is where the P1S earns its price premium over the P1P. The P1S ships with a fully enclosed chamber; the X1C has a partial enclosure. For ABS and ASA, a proper enclosure is the difference between warp-free functional parts and a peeled-up mess.
On P1S: 250–260°C nozzle, 100–110°C bed, enable chamber temperature if available. On X1C: same settings, but add a cardboard top cover or aftermarket enclosure seal for consistent results with ABS. ASA at these settings is more forgiving on the X1C due to slightly lower warping tendency.
Carbon Fiber Composites — Use the Right Nozzle
Both PLA-CF and PETG-CF run well on Bambu printers, but they require a hardened steel nozzle. Bambu sells hardened nozzles (0.4mm and 0.6mm) that fit the standard hotend. Install one before loading any CF filament — stock brass nozzles wear through in under 500g of CF material.
PLA-CF settings on X1C: 220–230°C, 35–55°C bed, 150–250mm/s. Slower than High Speed PLA, but the stiffness of CF parts justifies it. AMS compatible with hardened nozzle installed.
Filora PLA Filament 1KG
The most consistent PLA we make — zero failures on Bambu AMS
AMS Compatibility: What Works and What Does Not
The AMS works best with standard PLA, PLA+, Silk PLA, and PETG. High Speed PLA works well too. Materials that absorb moisture (Nylon, PA-CF) or require very slow speeds (TPU) are generally not AMS-compatible. TPU specifically must not be run through the AMS — it will jam the hub.
For hygroscopic filaments (Nylon, PETG), use a dry box with PTFE tube feeding directly into the AMS inlet slot as a workaround for moisture control without sacrificing multi-material capability.
Pressure Advance Calibration
Bambu machines run their own pressure advance equivalent (called PA or K-factor depending on firmware version). Each filament type needs its own calibration — do not skip it. Bambu Studio has a built-in calibration print: run it for every new filament, especially High Speed PLA, PETG, and CF composites. A wrong K-factor causes bulging corners and gaps in perimeters that no other setting will fix.
Final Recommendations by Use Case
- Fastest prints possible: High Speed PLA, 400–600mm/s, 0.4mm nozzle
- Functional parts, easy printing: PLA+, 250–350mm/s
- Moisture-resistant enclosures: PETG, 150–200mm/s
- Outdoor hardware: ASA on P1S with enclosure, 150mm/s
- Stiff lightweight structures: PLA-CF or PETG-CF, hardened nozzle, 150–200mm/s