Stringing in 3D model wall thickness (thin, unwanted strands) happens when molten filament oozes between printed lines or layers. Common causes include high nozzle temperature, insufficient retraction, or moist filament.
- High nozzle temp: Keeps filament too liquid, causing drips during nozzle moves. - Insufficient retraction: The printer doesn’t pull filament back far enough, leading to oozing between prints. - Moist filament: Trapped water turns to steam, forcing filament out unintentionally.
To fix it, lower the nozzle temperature by 5-10°C, increase retraction distance by 1-2mm, or dry filament (like PLA/PETG) in a dehydrator for 4-6 hours.