5个不可思议的3d打印项目，spacex的竞争对手，完全3d打印的火箭
Synopsis
最近几年，3D打印技术发展迅速，小到玩具零件，大到汽车房子，甚至火箭都能打印出来，3D打印技术在各个领域都有突出的进步 ...
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