Material Drying
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PA12 SLS Pore Defects
Problem Phenomenon
【Problem phenomenon】SLS printed PA12 parts had many internal pores, with density and strength not up to standard
Cause Analysis
Dampened material or insufficient preheating leads to pores: powder moisture vaporizes into pores during laser sintering; when preheating is insufficient, melting is inadequate and gas is entrapped; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Dry the powder at 80℃ for 6-8 hours before printing until the moisture content is below 0.1%; increase preheating temperature by 5-10℃; appropriately increase laser power to fully discharge internal gas
Key Takeaway
For SLS pores, first dry the powder and then raise preheating, with laser power assisting gas discharge; 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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