How to fix:
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1. The most obvious solution would be to clean your nozzle thoroughly. Using a piece of cloth that is damp with alcohol would be a good start to cleaning the entrance of the nozzle.
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2. Clean the inside with a nozzle cleaning needle while the printhead is still warm.
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3. Use a cleaning filament to unclog the nozzle.
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4. Try not to print with different types of filaments in different temperatures without first cleaning the nozzle.
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5. If nothing else works, you can try the cold pull technique to clean your hot end thoroughly.