【3D Printing】Bambu Lab A1 Series Repair Bundle Usage Tutorial

1Safe Unloading and Power Off

• [Important] Before performing any operations, be sure to turn off the printer and unplug the power cord.
•  Unload the filament from the printer (if power is off, you can manually cut the filament and pull it out).

2Remove the Toolhead Rear Cover and USB-C Cable

• Hold the bottom of the toolhead's rear cover, carefully pry it open and remove it.

• Use an Allen wrench to remove the 4 screws securing the USB-C data cable, then pull the cable upwards.

3Remove Extruder Main Board Screws and Disconnect Cables

• Remove the 3 black screws securing the extruder main board.

• Remove the 4 cables from the main board (use a flat tool to gently pry out the connectors, do not pull directly on the cables).

• Remove the eddy current sensor cable secured by 2 screws.

4Remove the Main Board and Feed Hall Board FPC Cable

• Remove the extruder main board from the toolhead.
• When removing, carefully pull the FPC flexible cable of the feed Hall board slowly upwards and disconnect it (avoid shaking the cable to prevent damage).

5Remove the Five-Way Assembly (Five-Way and Sensor)

• Remove the 2 screws securing the five-way assembly to the extruder.
• Gently lift the five-way assembly and place it above the toolhead.

6Separate and Replace the Sensor from the Five-Way Assembly

• Remove the 2 screws securing the sensor and separate the old feed Hall board (sensor) from the five-way assembly.

• Take out the new feed Hall board and peel off the blue protective layer from the FPC cable.
• Press the FPC cable towards the Hall board (the cable needs to align with the small groove between the two holes) and secure the new sensor back to the five-way assembly with 2 screws.

7Reassembly

• Place the five-way assembly back into the extruder and secure it with the 2 screws.

• Place the main board back into the toolhead and reconnect the feed Hall board cable.

• Reconnect the 4 cables of the main board and the 2-screw eddy current sensor cable.

• Secure the main board with the 3 black screws.

• Reconnect the USB-C data cable and tighten the 4 screws, then replace the toolhead rear cover.

8Function Verification

• Plug in and power on.
• Manually insert a section of filament into any feed port until it reaches the end, and observe the icon in the lower right corner of the screen:
• Filament inserted: Icon shows a green dot.
• Filament unloaded: Green dot disappears.
• Confirm that the green dot switches normally, which indicates successful filament sensor replacement. It is recommended to perform a full calibration after completion.

1Space Preparation and Safe Power Off

• Click Control to raise the X-axis, creating space for operation.
• [Important] Be sure to turn off the printer and unplug the power cord.
• Ensure the toolhead has completely cooled down.

2Remove Front Cover, Silicone Sock, and Nozzle

• Remove the toolhead front cover.
• Remove the black silicone sock.

• Open the metal buckle and remove the nozzle (hotend).

3Remove Extruder Screws and Pull Out Module

• Remove the 4 screws as shown (two on top, two in the middle).

• Carefully pull the extruder module forward slightly.
• Caution: Do not forcefully pull out the extruder module, as this may break the motor wires.

4Remove Toolhead Rear Cover, Connection Cables, and Right Side Small Cover

• At the bottom of the toolhead's rear cover, carefully pry it open and remove it.
• Carefully unplug the hotend assembly's connecting cable from its socket.
• Remove the right side panel of the toolhead.

5Unplug Connecting Cable and Disassemble Hotend Assembly (Three Screws)

• Unplug the hotend assembly's connecting cable.

• Use an Allen wrench to remove the three screws securing the hotend assembly.

• Remove the hotend heating assembly.

6Install New Assembly and Reassemble

• Place the new hotend assembly back into its position.
• Secure the hotend assembly by screwing back the three screws.

• Plug the cable back into its connector correctly.
• Push the extruder module back into place and secure the 4 extruder screws.
• Reinstall the nozzle, correctly fasten the buckle, and put on the black silicone sock.

• Reinstall the toolhead's right side cover.

7Test

• Plug in and power on. Go to Settings -> Maintenance -> Maintenance Mode -> Enable.
• Heat the nozzle to 250 degrees and confirm that the temperature rises normally.

5Install new assembly

• Align the new heating assembly with the hole.
• Screw back the three screws to fix it.
• Plug the new assembly's cable back into the slot.

6Reassembly and Testing

• Reinstall the nozzle and fasten the metal buckle.
• Replace the black silicone sock.
• Reinstall the front cover.
• Plug in and power on, enable Maintenance Mode, and heat to 250 degrees to confirm proper operation.

If you encounter a clog

Click Control, raise the X-axis to move it away from the print bed, creating space for maintenance.
Press
Control -> XYZ -> Z Up

Enable Maintenance Mode
Settings -> Second Page -> Maintenance -> Maintenance Mode -> Enable

Remove the three screws securing the part cooling fan.

Go back to Control -> Nozzle -> Heat to 250 degrees

Wait 30 seconds.
Use needle-nose pliers to remove the clogged material little by little.

Until the nozzle is exposed.
While heated, use needle-nose pliers to open the buckle and remove the nozzle.
Provided there is no clogged material on the hotend assembly's connecting wires,
you can clean all filament around the hotend assembly until there are no residues.

Finally, use a hairdryer to heat for 1-2 minutes until the filament starts to soften, then gently pull the filament away from the part cooling fan.

After cleaning, you can take a new nozzle from the repair kit.
Reinstall the nozzle, secure it with the buckle, and put on the hotend silicone sock.