Extrusion & Post
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PLA 3D Printing Interlayer Strength
Problem Phenomenon
PLA printed parts crack between layers with obvious layer lines, and the Z-direction strength is far lower than the X-Y direction
Cause Analysis
FDM layer-by-layer deposition causes insufficient interlayer molecular diffusion; low nozzle temperature, large layer height, and fast cooling all weaken interlayer bonding; interlayer strength is an inherent shortcoming of FDM
Solution
①Increase the nozzle temperature to 210-230℃ to enhance interlayer diffusion; ②Reduce the layer height; ③Reduce the cooling fan speed; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PLA printing interlayer strength relies on thermal diffusion; high temperature, low layer height and low cooling are the three elements to improve the Z-direction; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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