Bambu Lab Filament Sensor Base – A1 Series (FAC055)

Original Bambu Lab Filament Sensor Base for A1 and A1 mini printers. This base mounts directly to the top of the extruder module on the toolhead and forms a firm and precise mount for the filament sensor and Filament Hub for A1 series printers.

What the base is used for

• Allows for secure and precise mounting of the filament sensor (Hall board) on the side of the toolhead.
• Serves as a mounting base for the Filament Hub / AMS Lite Filament Hub, which guides the filament into the printer.
• Helps ensure reliable sensing of filament presence and movement, minimizing printing errors (e.g., "air" printing).
• Designed as an original service / replacement part – fully compatible and dimensionally accurate.

Key features

• Original Bambu Lab part – manufacturer Bambu Lab, part number FAC055, product designation BL-FAC055.
• Compatibility: Bambu Lab A1 and A1 mini (A1 series).
• Stable filament sensor mounting – the solid base eliminates play and ensures correct sensor positioning.
• Base for Filament Hub – also serves as the mounting point for the Filament Hub / AMS Lite Filament Hub.
• Simple replacement – designed for easy mounting onto existing toolhead attachment points.
• Durable design – robust plastic part designed for long-term operation in standard 3D printing conditions.

Installation and use

• The base mounts on the top side of the extruder module of the toolhead.
• The filament sensor is then attached to its side, and the Filament Hub for filament guiding is attached on top.
• Detailed replacement instructions can be found in the Bambu Lab user documentation / Bambu Wiki (A1/A1 mini Filament Sensor Base maintenance and replacement section).
• Recommended when:
  • the original base is damaged,
  • there are problems with mounting or misalignment of the filament sensor,
  • servicing the toolhead or upgrading.

Who the product is suitable for

• Users of Bambu Lab A1 / A1 mini printers who need to replace a damaged filament sensor base.
• Service technicians and print farm operators who want to have spare parts in stock for quick repairs.

Package contents

• 1× Bambu Lab Filament Sensor Base – FAC055

Note: The filament sensor and Filament Hub are not included in the package – this is only the base (holder).

Technical specifications

Benefits for your Bambu Lab A1 3D printers

• Higher filament sensing reliability thanks to a correctly mounted sensor.
• Quick restoration of functionality when the original part is damaged – no need to replace the entire module.
• Original Bambu Lab spare part guarantees full compatibility and trouble-free installation.

Key features:

• Original Bambu Lab spare part for the A1 series (A1 and A1 mini)
• Stable base for mounting the filament sensor on the toolhead
• Simultaneously serves as a mounting base for the Filament Hub / AMS Lite Filament Hub
• Precise dimensions and full compatibility with Bambu Lab A1 / A1 mini printers
• Easy and quick replacement thanks to mounting into original attachment points
• Increases filament detection reliability and 3D printing safety