NASA 開源了這幾十年的飛行器的3D結構，並有3D打印的模型
https://github.com/nasa/NASA-3D-Resources
比如[好奇號火星車](https://github.com/nasa/NASA-3D-Resources/tree/master/3D%20Printing/Curiosity%20Rover/Curiosity%20Rover%203D%20Printed%20Model/Detailed%20Curiosity%20Model%20(Large)) ，有空打印玩玩
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