Why Do My 3D Prints Have Gaps?
Common causes
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Partial nozzle clog: clean with a cold pull; replace nozzle if persistent
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Extruder slipping: drive gear teeth packed with filament dust, idler tension too low
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Wet filament: water flashes to steam at the nozzle, creating gaps
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Flow rate too low: calibrate with a single-wall test cube
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Print speed too high for the material: filament cannot melt fast enough
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Fix under-extrusion, Fix filament jams.
