The Bambu Lab Filament Buffer for the H2S is an essential accessory that regulates filament movement between the AMS system and the print head. It eliminates tension and loops in the filament, ensuring a stable and smooth material feed into the hotend - the key to trouble-free multi-material printing on the H2 series.

Stable filament feed into the hotend

The Filament Buffer works as a mechanical flow regulator for the filament between the external feeder (AMS) and the printer's extruder. It balances out differences between the unwinding and feeding speeds of the material, so the filament reaches the hotend evenly without sudden jolts or jams. The result is more stable extrusion and a lower risk of print artifacts.

Specifically for Bambu Lab H2S printers

This version of the buffer is designed exclusively for the H2S model. The shape, mounting holes, and internal mechanism match the design of this printer - a separate version exists for the H2D and H2C models. Before ordering, make sure you have the correct variant for your machine.

Eliminates tension in the filament

During multi-material printing or with long PTFE tube routing, unwanted tension can build up along the filament path. The buffer acts as a dampener - it temporarily takes up excess material and releases it when needed. This protects both the extruder and the filament itself from excessive mechanical stress.

Robust metal and plastic construction

The buffer body combines metal components with durable plastic. This combination ensures long service life and stability even during intensive operation with materials such as PLA, PETG, ABS, or technical materials like Nylon and Carbon.

Easy installation with included screws

The package includes a complete set of four BT3-8 screws, which let you attach the buffer directly to your printer in just a few minutes. No additional tools are needed beyond a standard Allen key. A detailed installation guide is available on the official Bambu Lab Wiki.

Compatibility with a wide range of materials

The buffer works universally - it doesn't matter whether you print standard PLA, technical ASA, polycarbonate, or even flexible filaments. It regulates material movement regardless of its mechanical properties.

Original part from the manufacturer

This is genuine accessory directly from Bambu Lab. Using original parts is important to maintain the printer's warranty and optimal performance. Third-party replacements may have different tolerances and cause filament feeding issues.

Technical specifications

Package contents

• 1x Filament Buffer (H2S version)
• 4x BT3-8 screw