Extra Credit : Will 3D printing changed the world? / Seoyoung Um

I think 3D printers are about changing the world. I mainly watch YouTube at home these days. I've also seen videos of 3D printers here and there that follow YouTube's algorithms. It was quite interesting. My house doesn't have a door lock yet, so I use the key to open and close the door. However, if you sometimes leave a key or forget it, you have to make one again. It's a pretty cumbersome process. However, if there was a 3D printer, the problem could be solved easily. And my friend's father had a small 3D printer. That's why he made a phone case for my friend. It's so rare. I remember being more robust than I thought and surprised. If it is used not only for small power generation but also for commercial purposes, it will contribute much more to social development.

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