¶ Issue Description
The touch screen displays error code 1251.
¶ Reasons
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The filament diameter is small and the gears cannot mesh successfully.
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The filament is broken in the PTFE tube.
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The filament sensor board in the tool head is triggered abnormally or is damaged.
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The filament runout board in the CANVAS is triggered abnormally or is damaged.
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The gears of the canvas are abnormally installed or worn.
¶ Troubleshooting Steps
¶ Tools needed for toubleshooting
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A caliper
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A 2.0 mm Allen key
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A 2.5 mm Allen key
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A pair of tweezers
¶ Step 1 Check whether the filament diameter remains stable.
If the filament diameter is excessively small, the gears cannot mesh properly, which may result in an error message. If a caliper is not available, you can use other filaments for testing.
How to measure the filament diameter with a caliper:
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Prepare one meter of filament and select five points on it.
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Check whether the diameter at these points is within the normal tolerance range.
For example, the normal tolerance range of ELEGOO PLA is ± 0.02 mm.
¶ Step 2 Check whether the PTFE tube and the 4-in-1 hub have any residual filament.
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Turn the power switch OFF (symbol "〇") and unplug the power supply cable.
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Check whether the PTFE tube has any residual filament.
- If the filament is broken in the PTFE tube on the CANVAS side:
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Press the end of the PTFE tube with a pair of tweezers and unplug the PTFE tube.
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Remove the broken filament.
- If the filament is broken in the PTFE tube on the 4-in-1 hub side, refer to the steps below to remove the 4-in-1 hub and take out the broken filament:
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Release and remove the screws securing the CAN bus and the tank chain with a 2.0 mm Allen key.
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Unplug the CAN bus and the tank chain.
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Release and remove the two screws securing the 4-in-1 hub with a 2.0 mm Allen key.
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Remove the 4-in-1 hub.
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Check whether the 4-in-1 hub and the gearbox have any residual filament.
¶ Step 3 Check whether the gears of the CANVAS are worn.
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Turn the power switch OFF (symbol "〇") and unplug the power supply cable.
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Unplug the CANVAS communication cable.
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Unplug the PTFE tubes on the upper and lower sides of the CANVAS. Gently press the end of the PTFE tube with a pair of tweezers and unplug the PTFE tube.
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Release and remove the three screws securing the CANVAS holder. Hold the CANVAS when releasing the last screw. Remove the CANVAS.
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Release and remove the six screws securing the CANVAS housing.
Note: Screws marked by yellow circle are M3 x 18.
Screws marked by blue circle are M3 x 8.
Screws marked by red circle are M3 x 45.
- Open the CANVAS housing and locate the gearbox of the feeder motor.
- Check whether the gears of the CANVAS is worn.
