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

1Safe Filament Unloading and Power Disconnection

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

2Remove Toolhead Back Cover and USB-C Data Cable

• Hold the bottom of the toolhead back cover, carefully pry it open and remove it.

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

3Remove Extruder Mainboard Screws and Disconnect Cables

• Unscrew the 3 black screws securing the extruder mainboard.

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

• Unscrew the 2 screws securing the eddy current sensor cable.

4Remove Mainboard and Feeder Hall Board Ribbon Cable

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

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

• Unscrew the 2 screws that secure the five-way assembly to the extruder.
• Gently lift the five-way assembly and place it on top of the toolhead.

6Separate and Replace Sensor from Five-Way Assembly

• Unscrew the 2 screws securing the sensor, and separate the old feeder Hall board (sensor) from the five-way assembly.

• Take out the new feeder Hall board and peel off the blue protective layer from the ribbon cable.
• Press the ribbon cable towards the Hall board (the ribbon cable must be aligned with the small groove between the two holes), and use 2 screws to fix the new sensor back onto the five-way assembly.

7Reassembly

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

• Place the mainboard back into the toolhead and plug in the feeder Hall board ribbon cable.

• Reconnect the 4 cables to the mainboard and the eddy current sensor cable with its 2 screws.

• Tighten the 3 black screws on the mainboard.

• Plug in the USB-C data cable and tighten the 4 screws, finally replace the toolhead back cover.

8Function Verification

• Plug in and power on.
• Manually insert a piece of filament into any feeding 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 ejected: Green dot disappears.
• Confirm that the dot changes normally, indicating that the filament sensor replacement was successful. It is recommended to perform a full calibration afterward.

1Space Preparation and Safe Power Disconnection

• Click "Control" to raise the X-axis, creating space for operation.
• [Important] Always 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 casing.
• Remove the black silicone sock.

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

3Remove Extruder Screws and Pull Out Module

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

• Carefully pull the extruder module out a little bit.
• Note: Do not forcefully pull out the extruder module, as this may break the motor wires.

4Remove Toolhead Back Cover, Connecting Cables, and Right Side Small Cover Plate

• Carefully pry open the bottom of the toolhead back cover.
• Carefully unplug the hotend assembly connecting cable from its socket.
• Remove the right side plate of the toolhead.

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

• Unplug the hotend assembly connecting cable.

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

• Remove the hotend heating assembly.

6Install New Assembly and Reassemble

• Place the new hotend assembly back into the hole.
• Tighten the three screws to secure the hotend assembly.

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

• Reinstall the toolhead's right side casing.

7Test

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

5Install New Assembly

• Align the new hotend assembly with the hole.
• Tighten the three screws to secure it.
• Plug the new assembly's cable into the slot.

6Reassembly and Test

• Reinstall the nozzle and secure the metal clasp.
• Put the black silicone sock back on.
• Reinstall the front casing.
• Plug in and power on, enable Maintenance Mode, and heat to 250 degrees to confirm proper operation.

If you encounter material wrapping

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

Open Maintenance Mode
Settings -> Page 2 -> Maintenance -> Maintenance Mode -> On

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 wrapped material little by little

Until the nozzle is exposed
While heated, use needle-nose pliers to open the clasp and remove the nozzle
Provided there is no material wrapped around the hotend assembly connecting cable
You can clean all filament around the hotend assembly until no residue remains

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 maintenance kit.
Reinstall the nozzle, secure it with the clasp, and put on the hotend silicone sock.