Extrusion & Post
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PA12 SLS Dimensional Deviation and Annealing
Problem Phenomenon
【Problem phenomenon】SLS printed PA12 parts had large dimensional deviations, with obvious deformation at unevenly cooled locations
Cause Analysis
Unreasonable slicing parameters and excessively fast cooling speed are the main causes; rapid cooling after printing causes uneven crystallization shrinkage and deformation; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Optimize slicing precision and scanning path; after printing is complete, cool naturally to room temperature before taking out the parts; after printing, anneal by holding at 100-120℃ for 2 hours to reduce dimensional deformation
Key Takeaway
SLS dimensions rely on slow cooling plus annealing for stability, and the timing of part removal is also a variable; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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