¶ When to use?
This guide is for troubleshooting the issues of cooling fan for hotend fan.
Common situations that require the replacement of cooling fan for hotend fan include:
-
The cooling fan for hotend makes noise during operation
-
The cooling fan for hotend has failed and will not spin
-
Bambu Lab technical support recommends replacement
¶ Tools and materials needed
- H2S cooling fan for hotend
-
H1.5 Allen key
-
25 minutes
¶ Screw List
- Screw A: Left and right screws of part cooling fan, 2 in total: BT2x5
- Screw B: The back of the part cooling fan (locked with the rear cover) and the toolhead rear cover screws, 3 in total: BT2x6.5
- Screw C: Cooling fan for hotend screws, 2 in total: BT2x4
¶ 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, open a new ticket in our Support Page and we will do our best to respond promptly and provide the assistance you need.
¶ Remove the Cooling Fan for Hotend
¶ Step 1: Loosen the Part Cooling Fan
- Unscrew the 3 screws of the part cooling fan. Note that the screw at the back is shared with the toolhead rear cover.
- After loosening the screws, the fan will naturally hang down.
Do not pull the fan forcefully to avoid damaging the connector!
¶ Step 2: Loosen the Toolhead Rear Cover
- Remove the 2 screws on the top of the toolhead rear cover to open the module interface cover;
- After opening the cover, gently push the toolhead rear cover from the inner wall with your fingers to release it.
¶ Step 3: Disconnect Connectors on the TH Board
- Disconnect the hotend heating assembly connector.
- Peel off the acetate tape covering the hotend fan connector.
Note: This acetate tape must be reapplied during reassembly. Keep it safe!
- Hold the base of the connector and pull it straight out perpendicular to the PCB to disconnect the cooling fan for hotend.
¶ Step 4: Remove the Hotend
Refer to this tutorial for hotend removal: Replace the H2S Hotend
¶ Step 5: Remove the Cooling Fan for Hotend
- Unscrew the 2 screws securing the cooling fan for hotend and remove it.
- Carefully pull the cable out of the cable channel.
¶ Install the Cooling Fan for Hotend
¶ Step 1: Install the Cooling Fan for Hotend
- Route the cable of the new cooling fan for hotend into the cable channel.
- Align the fan with the label side facing the hotend, matching the screw holes (refer to the red and yellow circles in the image below).
- Fold the fan cable into the designated groove before securing the fan.
- Tighten the two screws to secure the fan.
¶ Step 2: Install the hotend
Refer to this tutorial for hotend installation: Replace the H2S Hotend
¶ Step 3: Connect the plug to the TH board
- Place the plug's jack facing the socket on the TH board, align it, press down the plug, and connect the fan cable;
- Re-attach the acetate tape;
- Pre-align the screw holes of the fan, arrange the fan cable on the TH board, and pull it upwards, fold the cable to prevent it from being crushed by the fan housing or the toolhead rear housing of the toolhead and causing fan abnormality.
- After arranging the cables, insert the hotend heating assembly plug, and use the hotend heating assembly plug and cable to press the part cooling fan cable.
When inserting the hotend heating assembly, make sure to align the holes and do not arrange them wrongly.
¶ Step 4: Install the toolhead rear housing
Install the toolhead rear housing;
After installation, make sure the part cooling fan cable is in the dedicated notch to avoid being squeezed by the rear housing frame.
Tighten the 2 rear cover fixing screws.
¶ Step 5: Install the part cooling fan
Align the screw holes and install the part cooling fan; when inserting the fan, be careful not to press the fan cable.
If the cable is too long, return to step 1 of the installation guide and fold the excess cable first.
Tighten the three screws to secure the cooling fan.
¶ Verify the Functionality
Power on the printer and set the hotend temperature to 100°C. After a few seconds, the cooling fan for hotend should start to spin, and the installation is complete.
¶ Calibration after operation
After replacing the cooling fan for hotend, perform a full calibration to ensure optimal printer performance.
Additionally, it is highly recommended to clean the textured PEI build plate before printing, as the plate may have been contaminated during the replacement process. Please refer to Bambu Lab Textured PEI Plate Troubleshooting Guide.
¶ 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!