Retraction is the most impactful setting for print cleanliness. Properly tuned retraction eliminates stringing, reduces blobs, and creates clean surfaces between separated features.
How Retraction Works
When the nozzle travels between separated features, retraction pulls filament backward to relieve pressure. This prevents molten plastic from oozing during the move. Without retraction, every travel move leaves a string.
Distance and Speed
Bowden setups need 4-7mm retraction distance at 40-60mm/s. Direct drive needs 0.5-2mm at 25-40mm/s. Start with manufacturer recommendations and adjust based on results.
Common Issues
Too much retraction causes gaps at the start of new segments. Too little leaves strings. Too fast can grind filament. Too slow does not relieve pressure in time. Finding the balance requires methodical testing.
Material Differences
PLA retracts cleanly. PETG is inherently stringy and needs more aggressive retraction. TPU barely retracts at all — flexible material compresses rather than pulling back. Adjust settings per material.
Testing Method
Print a retraction test tower — a model with pillars at varying distances. Adjust retraction in 0.5mm increments between tests. Photograph results for comparison. The setting with no strings AND no gaps wins.
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