metal

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I think most people will use 3D printers to print stuff like cups, toys, key chains, and other small items where plastic is good enough unless you need a more durable metal item printed from a more expensive 3D printer which prints metal objects, and use more expensive metal to print out 3D...

I think laptops with metal cases are not necessary because laptops will more likely get replaced before the laptop's cheaper plastic case breaks, or cracks. I used a few laptops with a plastic cases, and the case still has not broke down. Soft metal like aluminium also can bend and get dents...