Bambu Lab Eddy Sensor for P2S (FAC155)

The original Bambu Lab Eddy Sensor (manufacturer code FAC155) is a special eddy current sensor located between the extruder and hotend of the Bambu Lab P2S printer. It is used for active real-time filament flow calibration, helping to achieve maximally precise and consistent extrusion.

By measuring changes in filament pressure and movement, the sensor allows the printer to automatically adjust the flow according to current conditions – material, print speed, or model geometry. The result is clean details, sharp edges, and even layers without under-extruded areas and unsightly blobs.

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Key features

• Original Bambu Lab spare part – full compatibility and reliability
• Designed for Bambu Lab P2S – compatibility confirmed by the manufacturer (code BL-FAC155 / FAC155)
• Eddy current flow sensor – measures changes in extrusion using eddy currents
• Active real-time flow calibration – minimizes both under- and over-extrusion
• Higher surface and detail quality – consistent extrusion over the full model height
• Helps prevent filament flow issues – more stable printing even at higher speeds
• Compact module – mounted between extruder and hotend
• Easy replacement – installation according to the official Bambu Lab manual

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Description and function

Bambu Lab Eddy Sensor is an eddy current sensor that:

• monitors filament behavior between the extruder and hotend,
• provides the printer with data for active flow compensation,
• helps the printer automatically set the correct flow at different speeds and accelerations,
• improves dimensional accuracy and surface finish of parts,
• supports stable printing of multi-material and multi-color models (with AMS 2/AMS 2 Pro).

This is especially important with the P2S, which operates at high speeds and uses advanced flow control algorithms. A properly functioning Eddy Sensor is key to unlocking the printer’s full potential.

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Compatibility

• Bambu Lab P2S

(Manufacturer code: FAC155, often also listed as BL-FAC155.)

Note: According to the manufacturer, this specific Eddy Sensor model is intended exclusively for the P2S. Different sensor variants exist for other Bambu Lab printers (e.g. H2D/H2S).

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Package contents

• 1× Bambu Lab Eddy Sensor for P2S (FAC155)

(Screws and mounting hardware may be part of the printer or other service kits – always follow the current official Bambu Lab manual.)

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Installation

• it is recommended to follow the official Bambu Lab manual for replacement/installation of the Eddy Sensor on the P2S,
• before installation, turn off and unplug the printer from power and allow the hotend to cool down,
• after assembly, it is advisable to perform a calibration and test print to verify proper sensor operation.

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Who this product is for

• users of the Bambu Lab P2S who need to:
  • replace a damaged or non-functional Eddy Sensor,
  • keep a spare sensor on hand to minimize printer downtime,
  • keep the printer in optimal condition for long-term reliable operation.

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Advantages of using the original Eddy Sensor

• Full compatibility with the P2S firmware and electronics
• Guaranteed measurement accuracy and stability compared to non-original parts
• Lower risk of print failures and flow errors
• Longer lifespan and reliability thanks to high-quality Bambu Lab materials and manufacturing

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Tips for use and maintenance

• Regularly check that there is no dirt or filament residue around the sensor.
• Do not use aggressive chemicals for cleaning; a soft brush or compressed air is sufficient.
• If the printer reports unusual flow errors, under-/over-extrusion, or a mismatch between feed and extrusion, the Eddy Sensor is one of the first parts you should check or replace.

Key features:

• Original Bambu Lab spare part with guaranteed compatibility for the P2S
• Eddy current filament flow sensor for active real-time calibration
• Helps achieve consistent extrusion and high surface quality
• Reduces the risk of under-extrusion, over-extrusion, and defects on models
• Intended exclusively for the Bambu Lab P2S 3D printer (code FAC155)
• Compact design for installation between extruder and hotend
• Easy replacement according to the official Bambu Lab manual
• Suitable as a spare part for quick printer recovery in case of sensor failure