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Comment by OnlyOneCannolo

Pretty difficult.

That would be like saying "How hard can it be to type a program into a computer?". Statistical process control, polymer science, release agent chemistry, die metallurgy / thermal / fluid / mechanical design, etc are large and deep fields.

There's probably a better video, but here's the official one about how Lego are made.

https://youtu.be/C3oiy9eekzk

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