Extrusion & Post
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Seven Causes of Black Specks in PEEK Printing
Problem Phenomenon
【Problem Phenomenon】Black specks appear on 3D printed PEEK parts, and there are also signs of carbonization at the nozzle outlet and its surroundings
Cause Analysis
There are seven causes of black specks: degradation at the junction of the hot end and nozzle, degradation of retention inside the nozzle, poor nozzle tip design, uneven heating, foreign matter mixing, melt retention too long, and excessive temperature; uniform heating of an all-metal hot end can suppress them
Solution
Use an all-metal hot end to ensure uniform temperature; control the printing temperature not to exceed the upper limit; shorten melt retention in the hot end; keep filament and feeding clean to prevent foreign matter; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
Troubleshoot printing black specks according to the seven causes; an all-metal hot end is the basic configuration; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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