Understanding and troubleshooting heater faults is crucial for maintaining the optimal performance of your 22 IDEX 3D printer. This guide explains how the temperature sensor works and provides steps to identify and resolve common heater faults.
In the 22 IDEX, we use a PT1000 temperature sensor, which is a type of thermistor. As the temperature increases, the resistance of the sensor changes. This change is measured by the mainboard, which translates it into a temperature reading. Our mainboard can detect even minimal changes in resistance, making it very precise and accurate. However, this precision requires a solid, stable, and good connection between the temperature sensor and the wiring.
One type of heater fault is characterized by temperature spikes on the temperature graph. Normally, the temperature graph should display a smooth line. Spikes, either up or down, indicate an issue with the wiring.
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Symptoms:
- Spikes in the temperature graph during printing or preheating.
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Verification Procedure:
- Turn off the machine using the power button or by removing the power cord.
- Inspect the wiring of the temperature sensor starting from the bottom.
- Look for damaged insulation or wires touching each other.
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Diagnosing the Issue:
- Temperature Spikes Down: This typically indicates that the wires are damaged and shorting, causing a decrease in resistance and a lower temperature reading. If the wires are completely shorted, the reading will show -273°C.
- If the wires or insulation are damaged, replace the temperature sensor.
- Temperature Spikes Up: If the wires are disconnected, the reading will show 2000°C, indicating a very high resistance or open contacts.
- Check the connections above the extruder and inside the distribution block.
- Eject the wires by pressing the orange tab in the distribution block, visually inspect, and reinsert them.
Another type of heater fault is caused by heater malfunction, indicated by a "temperature lower than expected" error.
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Symptoms:
- The error message appears when the temperature rises slower than expected.
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Causes:
- Part Cooling Fan: The fan blowing onto the heat block can cool it down, triggering the fault.
- Need for Calibration: The PID control might need recalibration.
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Fixing the Issue:
- Use silicone socks for the heat block or reduce the part cooling fan speed.
- Perform temperature tuning calibration:
- Go to Dashboard > Macros > System > Calibration > Temperature Tuning.
- Select the corresponding tool to calibrate.
- Ensure the nozzles are at ambient temperature before starting the calibration.
Heater faults can also occur in the Build plate, often due to a worn temperature sensor.
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Symptoms:
- Spikes in the Build plate temperature plot.
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Verification Procedure:
- Heat the Build plate to 150°C and move it up and down.
- Observe the temperature graph for spikes.
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Fixing the Issue:
- If spikes are observed, replace the temperature sensor for the Build plate.
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Other Issues:
- Temperature Lower Than Expected: This can occur if a cold print surface is placed on a hot Build plate, causing heat loss and triggering the fault.
Properly diagnosing and addressing heater faults is essential for maintaining the performance and longevity of your 22 IDEX 3D printer. By understanding the function of the temperature sensor and following the verification and fixing procedures outlined above, you can ensure your printer operates smoothly. If you encounter persistent issues, please contact our support team for further assistance.