Video tutorial available!
A video version of this replacement guide is also available. If you find the video more helpful, you can watch it here:
¶ Overview
¶ Structural description
- The toolhead can be broadly divided into 5 functional parts: cover, male mount, extruder unit, hotend, control board.
Disassembly and reassembly must be performed in the specified order.
Please read the steps below in full before attempting any operations.
¶ Difficulty and Time Estimate
- Difficulty：★★★☆☆ (moderate)
- Estimated Time：40mins
¶ Tools and Parts Required
- H2.0 hex key
- H1.5 hex key
¶ Toolhead disassembly
¶ Step 1. Remove the toolhead cover
- Use an H2.0 hex key to unscrew the three screws and remove the top cover & the rear cover
¶ Step 2. Remove the toolhead control board
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Disconnect the 6 cables of the toolhead control board
NO. Name 1 Extruder motor cable 2 Filament runout sensor cable 3 Calibration sensor cable 4 Hotend cooling fan cable 5 Ceramic heater cable 6 Thermistor cable Toolhead control board wiring guide（1/3）
Toolhead control board wiring guide（2/3）
Toolhead control board wiring guide（3/3）
- Use H1.5 and H2.0 hex keys respectively to unscrew screws 1 and 2, then remove the toolhead control board
¶ Step 3. Disassemble the hotend
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Use an H2.0 hex key to unscrew the 2 fixing screws and remove the hotend
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Remove the hotend silicone sock-1, ceramic heater spring clip-2, and cable holder-3 in sequence
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Remove the ceramic heater-1 and thermistor-2 in sequence
¶ Step 4. Disassemble the hotend cooling assembly
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Use an H1.5 hex key to unscrew the 3 fixing screws and remove the hotend cooling assembly
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Use an H1.5 hex key to unscrew the 2 fixing screws and remove the hotend cooling fan
¶ Step 5. Disassemble the extruder unit
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Use an H2.0 hex key to unscrew the 4 fixing screws and remove the extruder bearing holder
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Use an H2.0 hex key to unscrew the spring fixing screw and remove the compression spring—1 and the spring block—2
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Use an H1.5 hex key to unscrew the 2 fixing screws and sequentially remove the filament runout sensor—2, the driven extruder assembly—3, and the driving extruder assembly—4
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Use an H2.0 hex key to unscrew the 2 fixing screws and remove the extruder motor—1 and the motor heat shield—2
¶ Toolhead assembly
¶ Step 1. Assemble the extruder unit
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Install the motor heat shield and the extruder motor in the orientation shown, and use an H2.0 hex key to tighten the 2 fixing screws
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Install the driving extruder assembly and the driven extruder assembly sequentially, ensuring that the 3 gears shown mesh correctly. Rotate the active extruder gear to confirm that the other two gears turn smoothly, indicating proper installation
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Install the filament runout sensor and use an H1.5 hex key to tighten the 2 fixing screws
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Install the compression spring and spring block, placing the spring block above the compression spring, and use an H2.0 hex key to tighten the spring fixing screw
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Reinstall the extruder bearing holder and use an H2.0 hex key to tighten the 4 fixing screws
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Mount the assembled extruder unit back onto the toolhead male mount in the orientation shown, and use H1.5 and H2.0 hex keys to tighten fixing screws 1, 2, 3, and 4 respectively
¶ Step 2. Assemble the hotend cooling assembly
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Install the hotend cooling fan onto the fan base in the orientation shown (pay attention to the fan cable direction), and use an H1.5 hex key to tighten the 2 fixing screws
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Mount the hotend cooling assembly back onto the toolhead male mount, and use an H1.5 hex key to tighten the 3 fixing screws
¶ Step 3. Assemble the hotend
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Install the ceramic heater
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Install the thermistor (the probe tip needs to be bent 90°)
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Install the ceramic heater retaining spring in place
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Install the cable holder, paying attention to orientation
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Install the hotend silicone sock, ensuring the notched side faces the same direction as the cable holder
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Mount the hotend back onto the toolhead male mount, and use an H2.0 hex key to tighten the 2 fixing screws
¶ Step 4. Install the toolhead control board
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Route the filament runout sensor cable as shown, install the toolhead control board, and use H1.5 & H2.0 hex keys to tighten screws 1 and 2
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Reconnect all toolhead control board cables
NO. Name 1 Extruder motor cable 2 Filament runout sensor cable 3 Calibration sensor cable 4 Hotend cooling fan cable 5 Ceramic heater cable 6 Thermistor cable Toolhead control board wiring guide（1/3）
Toolhead control board wiring guide（2/3）
Toolhead control board wiring guide（3/3）
¶ Step 5. Cable management
- Route the cables as shown
¶ Step 6. Install the cover
- Install the toolhead rear cover and top cover, and use the H2.0 hex key to tighten the three top cover screws (screw 3 has a different specification from screws 1 and 2, please take note)
¶ 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.