Bambu Lab P2S Extruder Gear Assembly /Extruder Filament Sensor /Toolhead Housing

Extruder

The P2S extruder is equipped with three independent accessories:

Extruder Filament Sensor:

 Installed on the upper part of the extruder, it functions as a sensor for detecting filaments.

Extruder Gear Assembly:

Installed inside the extruder, it is driven by the extrusion motor to transport filament to the hot end or retract it from the extruder.

Toolhead Housing:

 The outer shell of the extruder.

• When to Use This Guide

  Common situations that require replacement of the Extruder Gear Assembly:

  Gear or bearing wear that causes printing abnormalities

  If Bambu Lab technical support advises that the gear assembly needs to be replaced

  Common situations that require replacement of the Extruder Filament Sensor Assembly:

  If the filament detection function fails

  Common situations that require replacement of the Toolhead housing:

  If physical damage affects usability

   

  Installation Note:
  The screws used for the filament sensor are the black BT2-5 screws. Please check during assembly, as excessively long screws may damage the components and cause detection abnormalities.

  Required Tools and Materials

• Parts that need to be replaced: Extruder Filament Sensor Assembly/extruder gear assembly/Toolhead housing assembly
• H1.5 Allen key
• H2.0 Allen key
• Tweezers

Disassembling the Extruder

Step 1: Remove the Toolhead Housing

Refer to the instructions for Replace the Toolhead housing to remove the toolhead housing.

Step 2: Release the Cutter

Hold the cutter handle and use an H2.0 Allen key to loosen the cutter handle screw, allowing the cutter to be fully detached from the extruder.

Step 3: Remove the Extruder

Press the pneumatic connector and pull out the PTFE tube.Use tweezers to open the connector cover on the extruder interface board and disconnect the feed Hall plate cable.Use an H2.0 Allen key to remove the four screws, then take out the extruder.

Step 4: Remove the Extruder Filament Sensor

Use an H1.5 Allen key to remove the two screws and remove the extruder filament sensor.

Step 5: Separate the Extruder front cover and extruder gear assembly

The extruder contains many small components. To prevent any parts from falling out, place it on a clean surface with the gears facing upward.

Use an H2.0 Allen key to loosen the single screw and remove the yellow extruder drive wheel from the extruder.

Tip:

When filament is jammed between the extruder’s drive wheel and driven wheel, you may not be able to remove the drive gear directly from the front.If you can’t remove it directly, tap the shaft from the back side of the drive gear to push it out. Tap at the location shown below:The removal process is as follows:

Remove the pressing block, extrusion driven wheel and other accessories from the extruder front cover.

Assembling the Extruder

Step 1: Install the extruder gear to the extruder front cover

Install the extruder driven wheel onto the extruder front cover.

Install the spring and metal end cap into the clamping block, close to the extrusion driven wheel, and install the clamping block onto the extruder front cover.Install the extrusion drive wheel assembly and tighten the single screw.

Step 2: Install the Extruder Filament Sensor

Install the extruder filament sensor onto the extruder, and tighten the two screws.

Step 3: Install the extruder assembly

Install the extruder onto the toolhead carriage.Tighten the four screws.Connect the extruder filament sensor cable to the connector on the extrusion interface board. Close the connector and press the connector cover down until it fits snugly over the flexible cable.

Step 4: Install the cutter

Hold the cutter handle with your hand, slide the cutter into the extruder along the position of the cutter groove of the extruder, and tighten the handle screw with an Allen key.

Step 5: Install the Toolhead Housing

Refer to the instructions for Replace the Toolhead Housing to install the toolhead housing.

Verifying Functionality

• Ensure the handle moves smoothly.
• Power on and verify that the extruder filament sensor board can detect the status of the filament line normally.
• Power on and confirm that the extruder can be driven normally by the extruder motor.