¶ Overview
¶ Location
The filament runout sensor is located inside the extruder unit. To access the filament runout sensor for replacement, the extruder unit must be removed and disassembled.
¶ Terminology
Different from our official term, some people may use the following terms to describe this component:
- Filament sensor
¶ Difficulty and Time Estimate
- Difficulty：★★☆☆☆ (Easy)
- Estimated Time：20 minutes
¶ Where to Buy
US: https://us.snapmaker.com/products/filament-runout-sensor-kit-for-snapmaker-u1
EU: https://eu.snapmaker.com/products/filament-runout-sensor-kit-for-snapmaker-u1
Global: https://shop.snapmaker.com/products/filament-runout-sensor-kit-for-snapmaker-u1
¶ Tools and Parts Required
- H1.5 hex key
- H2.0 hex key
- New filament runout sensor
¶ 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
Before proceeding, please turn off the machine and unplug the power cable!
- 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 extruder unit
¶ 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 Remove the extruder unit
- Disconnect the extruder unit cables.
- Use the H1.5 and H2.0 hex keys to unscrew PCB fixing screw 1 and screw 2 respectively.
- Pull out the cables from the clips of the extruder unit.
- Use the H1.5 hex key to unscrew fixing screw 1 and screw 2, and use the H2.0 hex key to unscrew fixing screw 3 and screw 4, then remove the extruder unit.
¶ Step 3. Remove the old filament runout sensor
- Use the H2.0 hex key to unscrew the 4 fixing screws, then remove the extruder bearing block.
- Use the H1.5 hex key to unscrew the 2 fixing screws, then remove the old filament runout sensor.
¶ Step 4. Install the new filament runout sensor
- Install the new filament runout sensor, then use the H1.5 hex key to tighten the 2 fixing screws.
- Reinstall the extruder bearing block, then use the H2.0 hex key to tighten the 4 fixing screws.
¶ Step 5. Install the extruder unit
- Place the extruder unit in the position as shown, then use the H1.5 hex key to tighten fixing screw 1 and screw 2, and use the H2.0 hex key to tighten fixing screw 3 and screw 4.
- Reinstall the PCB. Note that the 3 cables of the extruder unit must be routed as shown in the picture.
- Use the H1.5 and H2.0 hex keys to tighten PCB fixing screw 1 and screw 2 respectively.
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Reconnect the extruder unit cables.
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Organize the cables as shown.
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Install the top cover of toolhead.
- Install the back cover of toolhead.
¶ Step 6. Install the Toolhead
¶ 6.1 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
¶ 6.2 Connect and secure the USB cable
- Plug in the USB cable and fasten the two screws with the H2.0 hex key.
¶ 6.3 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.
¶ Reach out to Snapmaker Support
After following the troubleshooting steps, if you find it difficult to resolve your issue, kindly submit a support ticket through https://snapmaker.formcrafts.com/u1-troubleshooting-request and share your troubleshooting results with some pictures/videos.
Our dedicated support team will be more than willing to assist you in resolving the issue.