Bambu Lab printers are often bought as a complete system, but the filament question is decided by two hardware facts: whether the machine is enclosed, and whether the AMS can feed the material.
Open-frame and enclosed machines behave differently
Bambu Lab lists PLA, PETG, TPU and PVA as ideal for the A1 and A1 mini. ABS, ASA, PC, PA, PET and carbon or glass fibre reinforced polymers are marked not recommended on those open-frame machines, because they warp and release fumes without a controlled chamber. The P1S and X1 series are enclosed, which is what makes ABS, ASA, PC and PA practical.
What the AMS can and cannot feed
The standard AMS is designed around rigid filament. Bambu Lab states that TPU is not compatible with AMS, and among the AMS family only the AMS HT supports it. A dedicated low-hardness TPU grade exists for AMS use, but that is a specific product rather than a general rule. If you print flexible parts regularly, plan to feed TPU from the external spool holder.
Nozzle choice follows the filler, not the colour
Reinforced grades such as PLA-CF, PETG-CF and PA-CF need a hardened steel nozzle because the fibre abrades brass. Bambu's compatibility tables also mark the 0.2 mm nozzle as incompatible with fibre-filled filaments and with several engineering grades, so 0.4 mm and above is the practical starting point.
A simple selection order
- Enclosed machine? If no, stay with PLA, PETG, TPU or PVA.
- Feeding from AMS? If yes, choose rigid filament and keep TPU on the external holder.
- Fibre filled? If yes, switch to hardened steel and avoid the smallest nozzle.
Checking those three points first avoids most failed prints and blocked AMS units. Filament that is dimensionally consistent and properly dried feeds far more reliably in these systems, which is why tolerance and moisture control matter as much as the material name.
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