据央视财经，3D打印，学名“增材制造”。以火箭推力室喷管为例：它的内壁布满密密麻麻的冷却通道，最细处直径仅1毫米，如同人体毛细血管。这些通道但凡有一处堵塞或偏差，火箭就可能面临失效风险。在3D打印出现之前，这类零件全靠传统工艺制造。但航天零件往往形状奇特、内部复杂，传统制造方法要么做不出来，要么只能分件加工再拼装，工期长达数月。更要命的是，每一个焊缝、每一颗螺钉，都可能成为未来的“失效点”。 3D打印的出现提供了更多的可能性。材料精准利用。打印时材料“用多少铺多少”，几乎不产生废料，尤其对钛合金等昂贵材料，利用率可稳定保持在90%以上。如今，这项技术已广泛应用在航天器材上，同时也渗透到医疗、新能源汽车、半导体、消费电子甚至建筑领域。在一些特殊场景中，3D打印正从“替代方案”变成“唯一方案”。
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