Bambu Lab Filament Cutter Lever – H2S (FAC143)

The original filament cutter lever for Bambu Lab H2S is a key component that holds and controls the cutting blade during automatic filament cutting. During material changes or filament unloading, it ensures a clean and precise cut so that the AMS / feeder can retract the filament without issues, preventing errors and jams.

This part is specifically designed for the Bambu Lab H2S print head and corresponds to the manufacturer designation FAC143.

Key Features

• Original Bambu Lab replacement part – fully compatible with the H2S print head
• Precise blade guidance and control – the lever holds the cutter blade and mechanically activates it for a clean filament cut
• Reduction of print errors – helps prevent "filament cutter stuck" errors and filament unloading problems
• Complete assembly kit – including lever, spring, screw, washer, and snap ring
• Durable materials – combination of plastic and metal parts for long service life
• Compact dimensions – small part that is easy to store as a spare

Package Contents

• 1× Filament Cutter Lever
• 1× torsion spring
• 1× screw (BT2.6)
• 1× washer
• 1× snap ring / circlip

Technical Parameters

Note: The listed dimensions and weight are approximate package values based on manufacturer and distributor data.

Why keep a filament cutter lever in stock

The filament cutter lever is a mechanical component subjected to mechanical stress – frequent filament changes or the use of harder materials can lead to wear or damage over time.

Keeping a spare lever in stock brings several advantages:

• Minimal printer downtime – in case of damage, simply replace the part quickly
• Stabler operation – reducing the risk of filament jams in the cutting area
• Safer service – replacement with an official part without the need for non-original modifications

Installation and Maintenance (Briefly)

Before any intervention, turn off the printer and disconnect it from the power supply.

1. Remove the front cover of the print head according to the official Bambu Lab instructions.
2. Access the filament cutter mechanism and carefully remove the original lever, including the snap ring and spring.
3. Position the new lever, install the torsion spring, washer, and secure with the snap ring.
4. Check that the lever moves smoothly and is not obstructed by any cable or plastic part.
5. Reinstall the cover and perform a filament cut test as recommended by the manufacturer.

For a detailed procedure, always follow the official Bambu Lab service manual for H2S.

Application

This part is primarily intended for:

• repairs after mechanical damage of the filament cutter lever,
• resolving issues with incomplete filament cuts or cutter error messages,
• preventive maintenance of a Bambu Lab printer with the H2S print head.

Thanks to the original filament cutter lever, your Bambu Lab printer will reliably cut filament again during every material change.

Key Features:

• Original Bambu Lab replacement part for the H2S print head
• Precise holding and activation of the blade for a clean filament cut
• Helps prevent "filament cutter stuck" errors and filament unloading problems
• Complete replacement kit including lever, spring, screw, washer, and snap ring
• Combination of durable plastic and metal for long service life
• Compact dimensions and low weight – ideal as a spare part in stock