Bambu Lab Extruder Interface Board V9 – X1 Series

Bambu Lab Extruder Interface Board V9 (FAE004) – TH Board for X1 Series

Genuine Bambu Lab Extruder Interface Board V9 (FAE004) replacement. Main toolhead board for X1 series printers.

Key Features

• Toolhead Control – Central board handling toolhead signals and connections
• OEM Replacement – Genuine Bambu Lab electronics
• Restores Function – Helps resolve toolhead comms, fan/heater control, and sensor-related issues when the board is damaged
• Direct Fit – Mounting and connectors designed for X1 series toolhead

When to Replace

• Toolhead Errors – Communication failures with mainboard
• Hotend Issues – Heating or temperature failures
• Extruder/Fan Failures – Components not responding
• Physical Damage – Visible damage or burnt components
• LIDAR Errors – First layer detection issues

Installation / Diagnostic Guide

Based on Bambu Lab Wiki

1. Power off – Turn off and unplug the printer before working on toolhead electronics.
2. Access the toolhead – Remove the toolhead covers to expose the board and wiring.
3. Photograph connectors – Take clear photos of every connector and cable route.
4. Disconnect cables – Unplug heater/fan/sensor connectors carefully (avoid bending pins).
5. Swap the board – Remove mounting screws, replace the board, and reinstall screws.
6. Re-test – After power-on, run a heat test and fan test, then print a small model to confirm stability.

Compatibility

Specifications

Related Products

• X1 Hotend Assembly
• X1 Series Parts