Tools:
① Needle nose pliers
② 1.5mm hex wrench
③ 2.5mm hex wrench
1. Unload any filament from the hot end with the thermocouple to be replaced. This guide will use the left hot end as an example.
1)Select "Utilities" on the touchscreen to begin unloading any filament from the hot end.
Figure 1 Enter the "Utilities" page.
2)Set the temperature of the left nozzle to an appropriate unloading temperature. For example, if Raise3D Premium PLA filament is loaded in the left nozzle, its default loading temperature is 215℃. In our demonstration, we will set the left nozzle temperature to 215℃ to unload the filament.
Figure 2 Set the temperature of the left nozzle.
3)Press the "Unload" button, and the hot end will automatically begin to heat. When the hot end reaches the target temperature, select "Load". The printhead will pre-extrude some filament from the hot end and then will retract and unload the filament.
Figure 3 Unload the filament.
4)Firmly depress the metal ring of the quick connector on the printhead, and carefully extract the filament guide tube from the quick connector.
Figure 4 Remove the filament guide tube.
5)Gently assist the filament out of the printhead. When all of the filament is removed from the printhead, press "OK" on the touchscreen to end the unloading process.
Figure 5 Remove the filament.
1. Power off the printer at the rocker switch located at the rear of the machine.
Note: Do not operate the printer with power on, to avoid personal injury and damaging the machine.
2. Lift the red buckle upwards on the interchangeable hot end. Grasp the component by the black handle and pull horizontally to remove and disconnect the hot end.
Figure 6 Open the quick release hot end.
3. Use a 2.5mm hex wrench to loosen the 4 screws of the fan guard and fan, and remove the fan guard and fan together to access the set screws used to secure the hot end to the interchangeable component.
Figure 7 Loosen the four screws of the fan guard and fan.
4. Use a 1.5mm hex wrench to loosen the 2 screws securing the hot end assembly.
Figure 8 Loosen the 2 screws securing the hot end.
5. Depress the latches of the connectors to remove the thermocouple wire and heating rod wire connections from the board on the interchangeable component.
Figure 9 Remove the thermocouple wire and heating rod wire.
6. Carefully use pliers, if necessary, to securely clamp the aluminium heating block to extract the hot end assembly from the interchangeable component. The hot end should slide outward without resistance. If there is resistance, verify that the 2 set screws (in the steps prior) have been loosened.
Figure 10 Pull out the hot end assembly.
7. After the hot end has been successfully extracted, unscrew the thermocouple component from the heating block.
Figure 11 Remove the thermocouple wire.
1. Prepare a new thermocouple.
Figure 12 Prepare a new thermocouple.
2. Install the thermocouple component into the hot end.
Figure 13 Install the thermocouple component into the hot end.
3. Verify that the throat tube has not become loose during this process. Carefully tighten the throat, if necessary, into the heater block to prevent material leakage during printing.
Important: Do not bend this component during this verification process.
Figure 14 Secure the throat tube against the nozzle in the heater block.
4. Reconnect the heating rod wire and thermocouple wire back into their respective connectors.
Figure 15 Insert the thermocouple wire and heating rod wire into the board connectors.
5. Carefully align and fully insert the hot end assembly into the interchangeable component.
Note: Be sure to fully insert the throat tube, otherwise a gap could cause filament leakage during the printing process.
Figure 16 Insert the hot end assembly into its original position.
6. Use a 1.5mm hex wrench to fasten the two set screws securing the hot end assembly. It is important to hold the heating block firmly seated to prevent introducing a gap, which could result in filament leakage during the printing process.
Important: Do not bend the throat tube.
Figure 17 Fasten the two set screws securing the hot end assembly.
7. Use a 2.5mm hex wrench to fasten the 4 screws securing the fan guard and fan component.
Note: When installing the fan, the electrical wire must be slotted into the channel to avoid damaging the wire.
Figure 18 Note the channel for the electrical wire of the fan.
8. Align the interchangeable hot end with the groove on the extruder. Insert the interchangeable hot end horizontally until the pin on the red tab aligns with the one on the printhead. Press downward on the red buckle to secure the interchangeable hot end into place.
Figure 19 Install the interchangeable hot end.
For this recommended calibration, you will need to have 2 spools of Raise3D Premium PLA filament loaded into the left and right printhead. Perform the 5-step offset calibration to calibrate the nozzle height and offset.
1. Select the gearwheel icon in the upper right corner to enter the Setting interface. Then, in the Machine tab, select "Maintenance" > "Offset Calibration".
Figure 20 Enter the Offset Calibration page.
2. Verify that the printer meets all the requirements on the touchscreen, and then select "Start". You will enter the 5-step Offset Calibration interface, please complete each step.
Figure 21 Run the 5-step Offset Calibration.
3. Check if there is any filament leaking during printing. If the hot end component leaks, reinstall the hot end assembly following the steps in this tutorial or contact Raise3D after-sales support for troubleshooting assistance.
[15.084-EN.2.0.20240204-Pro3 Series-How to Replace the Thermocouple]
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