PLA (Polylactic Acid) 3D printing material becomes flexible and soft at approximately 60°C, which is why it cannot withstand boiling water temperatures despite having a strong structural shape; this demonstrates that material properties fundamentally limit the practical applications of 3D printed objects regardless of their geometric design.
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PLA vs boiling water… who wins? ☕Added:
PLA becomes flexible at around 60° Sunflower asked if I could design a cup that survives boiling water. The project worked, but physics still won. The plastic became soft anyway.
Still, as a toy, this shape can take a lot. All because
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