¶ Dual Extruder Unit
The extruder is responsible for pulling filament from the spool and feeding it into the hotend. The filament is heated and melted in the hotend, then extruded through the nozzle to create the printed model.
The extruder must precisely control the extrusion and retraction of the filament to ensure dimensional accuracy and surface quality of the printed model. It is one of the core components of a 3D printer.
The spare parts for the dual extruder unit include the following:
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Dual extruder unit (including extruder servo motor) * 1
-
BT2.6x8 screws * 2
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M2.5x8 screws * 4
¶ When to use
-
The extruder is damaged.
-
The extruder servo motor is malfunctioning.
¶ Tools and materials needed
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New dual extruder unit
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H2.0 Allen key
-
Tweezers
Specifications and quantities of screws involved in replacing the H2D dual extruder unit (it is recommended to keep the removed screws properly to avoid loss):
| Specification | Image | Use | Position | Quantity | |
|---|---|---|---|---|---|
| BT3x8 | Fix the part cooling fan air duct |    |
4 | ||
| BT3x20 | Fix the part cooling fan |  |
2 | ||
| BT2.6x8 | Fix the part cooling fan |   |
2 | ||
| Fix the extruder (marked by the red circle) |  |
2 | |||
| M2.5x8 | Fix the extruder (marked by the green square) |  |
4 |
¶ Safety Warning
IMPORTANT!
It's crucial to power off the printer before conducting any maintenance work, including work on the printer's electronics and tool head wires. Performing tasks with the printer on can result in a short circuit, leading to electronic damage and safety hazards.
During maintenance or troubleshooting, you may need to disassemble parts, including the hotend. This exposes wires and electrical components that could short circuit if they contact each other, other metal, or electronic components while the printer is still on. This can result in damage to the printer's electronics and additional issues.
Therefore, it's crucial to turn off the printer and disconnect it from the power source before conducting any maintenance. This prevents short circuits or damage to the printer's electronics, ensuring safe and effective maintenance. For any concerns or questions about following this guide, we recommend submitting a technical ticket regarding your issue and we will do our best to respond promptly and provide the assistance you need.
¶ Remove the Dual Extruder Unit
¶ Step 1: Remove the hotend
The flow blocker is located on the lifting rod. By moving the rod, the flow blocker moves left and right.
If you need to remove a hotend but the flow blocker is blocking it, first move the flow blocker connecting rod to shift the flow blocker away, then remove the hotend. This prevents accidentally bending the flow blocker during removal.
When moving the connecting rod, the flow blocker may not fully shift in one motion due to the connecting rod tilt limit. Ensure the magnet at the end of the connecting rod is attached to the magnet bracket and the flow blocker is fully in place.
Remove the silicone sock for hotend that is not blocked by the flow blocker. Unlock the buckle to detach the hotend, then pre-lock the buckle of the hotend heating assembly.
Move the flow blocker connecting rod again to shift the flow blocker to the other side. Remove the silicone sock of the remaining hotend, unlock the buckle to detach the hotend, and pre-lock the buckle of the hotend heating assembly.
¶ Step 2: Remove the part cooling fan air duct and fan
You can refer to this Wiki to remove the part cooling fan air duct and fan for easier removal of the dual extruder unit:
How to replace the H2D part cooling fan
¶ Step 3: Remove the dual extruder unit
- Use an H2.0 Allen key to remove the 4 fixing screws (red circles: BT2.6x8 * 2; green boxes: M2.5x8 * 2). Then, hold the left and right cutters and use the H2.0 Allen key to remove 2 screws located at the bottom of the dual extruder filament guide (green squares: M2.5x8).
- Unlock the connector clip of the 2004 switching motor, unplug the cable, then unclip and unplug the extruder servo motor connector. Next, unclip and detach the extruder hall sensor board connector. Finally, press the two pneumatic connectors at the top to remove the two PTFE tubes.
- Slide the dual extruder unit forward to remove it from the toolhead. Tilt the extruder while removing it to avoid interference between the extruder servo motor cover and the middle frame, which may prevent removal.
¶ Install the Dual Extruder Unit
¶ Step 1: Install the dual extruder unit
- First, thread the extruder hall sensor board connector through the TH board. You can fully pass the cable through.
- Adjust the FPC cables of the 2004 switching motor and extruder servo motor to a suitable angle, align them with the small hole on the upper right, and slowly thread them through the small holes in the TH board and toolhead middle housing. During this process, you can insert the Allen key from the side of the toolhead to push the FPC cable upward for assistance.
- Insert the extruder servo motor FPC cable into the TH board connector and lock the clip. Then, plug the 2004 switching motor cable into the extruder connection board connector and lock the clip. Finally, plug the foolhead sensor FPC cable into the TH board connector and lock the clip. Fold the excess cable and tuck it into the gap between the TH board and extruder connection board.
If the 3513 extruder servo motor cable is difficult to install, you can first remove the extruder connection board to connect it. Refer to this Wiki for removing the extruder connection board:
- Use an H2.0 Allen key to tighten the 4 fixing screws (red circles: BT2.6x8 * 2; green squares: M2.5x8 * 2). Hold the left and right cutters, place the screws on the H2.0 Allen key, and secure the 2 screws at the bottom of the dual extruder filament guide (green boxes: M2.5x8).
- Snap the extruder hall sensor board connector into the inner side of the toolhead middle housing.
¶ Step 2: Install the part cooling fan air duct and fan
You can refer to this Wiki to install the part cooling fan and air duct:
How to replace the H2D part cooling fan
¶ Step 3: Install the hotend
Similar to the removal process, if you need to install a hotend but the flow blocker is blocking it, first move the flow blocker connecting rod to shift the flow blocker away, then proceed with installation to avoid bending the flow blocker.
When moving the linkage, the flow blocker may not fully shift in one motion. Move the connecting rod again to ensure the magnet at the end of the connecting rod is attached to the magnet bracket and the flow blocker is fully in place.
Install the right nozzle, lock the nozzle buckle, and put on the silicone sock for hotend.
Move the flow blocker connecting rod to shift the flow blocker to the other side, then install the left nozzle. Lock the nozzle buckle and put on the silicone sock for hotend.
Note: When installing the left silicone sock for hotend, ensure it is not tilted to avoid deforming the wind blocker.
¶ Verify the Functionality
Connect the power and turn on the printer. Start a print job to check if the printer can complete the print successfully.
¶ End Notes
We hope the detailed guide provided has been helpful and informative.
If this guide does not solve your problem, please submit a technical ticket, we will answer your questions and provide assistance.
If you have any suggestions or feedback on this Wiki, please leave a message in the comment area. Thank you for your support and attention!