What it is

Alternative (non-original) hall switch – filament sensor board for Bambu Lab P1P/P1S printers. It uses the Hall effect to detect the proximity of a magnet and thus reliably recognizes:

• whether filament is present in the extruder,
• and the position of the filament cutter lever.

Compatibility

• Designed for: Bambu Lab P1 Series (P1P, P1S)
• Incompatible with: X1/X1C/X1E and A1/A1 mini.

Why choose it

• Fast and cost-effective replacement for the original sensor.
• Accurate detection of filament and cutter lever – reduces unnecessary pauses and error messages.
• Maintained functionality with AMS (P1 Series): correct signaling of material loading/unloading.

Assembly and maintenance

• Replacement takes place in the front of the tool head/extruder; we recommend following the Bambu Lab Wiki procedure for P1. Turn off the printer and disconnect the power before operation.
• In case of reliability issues, check the cleanliness of the sensor and the correct orientation of the magnet in the mechanism – incorrect orientation can cause false detections.

Package contents

• Hall switch/filament sensor PCB
• Flexible interconnect cable (FPC) Note: Mounting screws and adhesive are not included in this alternative version. Some original kits include them, this replacement typically does not.

Weight

• Approximate product weight: ~0,023 kg (0,05 lb).

Note

This part is an alternative compatible replacement, not an original Bambu Lab accessory. Functionally, it corresponds to the purpose of the original "Extruder Filament Sensor – P1 Series".

Key features:

• Alternative compatible replacement for the original P1 Series sensor
• Accurate and fast filament and cutter lever detection for reliable printing
• Compatibility exclusively with P1P/P1S – no firmware modifications required
• Includes flexible FPC cable for easy connection
• Durable contactless Hall technology with minimal mechanical stress
• Suitable for preventing downtime – it pays off to have a spare sensor on hand