Adopts hardened steel gear drive to increase extrusion force and prevent slipping. Includes filament runout detection components to monitor printing status in real-time and reduce the risk of model printing failure. Pre-assembled extrusion unit for easy replacement. Compatibility Snapmaker U1 U1 extruder unit replacement guide The extruder unit is located inside the toolhead. To access the extruder unit for replacement, the top cover and PCB must be removed. Terminology Different from our official term, some people may use the following terms to describe this component: Extruder assembly Difficulty and Time Estimate Difficulty：★★★☆☆ (Easy) Estimated Time：20 minutes When to Replace When the extruder unit is damaged. Tools and Parts Required H1.5 hex key H2.0 hex key New extruder unit Procedure Step 1. Remove the toolhead 1.1 Unload filament Tap the specified area on the touchscreen (Highlighted in red in the image below). Tap "Unload Mode". Select the target toolhead (e.g., No.2) and tap "Unload". Wait for the system to automatically complete the filament unloading. 1.2 Detach the toolhead from the docking bracket For head No.1: Slide to the right until the locating pin is fully visible. For heads No.2/3/4: Slide the toolhead to the left until the locating pin is fully visible. 1.3 Remove filament and guide tube Remove the three cable clips. Press the quick-release fitting. Remove the filament and the filament tube. 1.4 Disconnect USB and remove the toolhead Use the H2.0 hex key to remove the two mounting screws. Unplug the USB cable and then carefully remove the toolhead. Step 2. Remove the PCB 2.1 Remove top cover and back cover Use the H2.0 hex key to remove the three screws securing the top cover of the toolhead, then remove the top cover. Remove the back cover of the toolhead. 2.2 Disconnect the cables and remove the PCB Disconnect the cables from the PCB. When installing the toolhead PCB, please refer to the wiring diagram below. Use the H1.5 hex key to remove the M2×6 screw, and the H2.0 hex key to remove the ST2.6×6 screw, and then remove the PCB. Step 3. Replace the extruder unit Remove the 4 screws using an H1.5 and H2.0 hex key as shown, then remove the old extruder unit. Install the new extruder unit and secure it with the 4 screws. Step 4. Reassemble the toolhead Place the PCB in the position as shown. Use the H1.5 hex key to tighten the M2×6 screw, and the H2.0 hex key to tighten the ST2.6×6 screw. Reconnect the PCB cables and organize the cables as shown in the picture below. Reconnect cables: Organize cables: Install the top cover of toolhead. Install the back cover of toolhead. Step 5. Install the toolhead 5.1 Place the toolhead onto the docking bracket Before installing the toolhead, please make sure the sliders are in the correct positions. The slider for Toolhead No. 1 should be set to the far left, while the sliders for Toolheads No. 2, 3, and 4 should all be set to the far right. You can use a hex key to adjust the slider and make sure the red mark on the slider is visible. Align the hole on the toolhead with the long locating pin on the docking bracket, and push inward until it stops. The illustrated side of the toolhead should face inward. Align the two locating pins on the toolhead with the holes shown on the mount. For No.1 head: hole is to the left of the pins For No.2/3/4 heads: hole is to the right of the pins 5.2 Connect and secure the USB cable Plug in the USB cable and fasten the two screws with the H2.0 hex key. 5.3 Load filament While pressing part 1, as highlighted in the image below, insert the filament into part 2 until it reaches the end. Finally, connect the filament tube. The toolhead installation is now complete.