When printing with PETG on a Bambu P1 series printer, stringing and oozing can occur if the nozzle temperature is set too high. PETG has a high melt flow index, and excessive heat causes the material to become overly fluid, allowing it to leak from the nozzle during non-print travel moves. Even if a filament profile worked previously, minor variations in ambient temperature or updated slicer presets may push the nozzle temperature beyond the optimal range for the specific batch of filament, resulting in persistent stringing.
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