Before 3d printing, this would have been an impossible shape to cast or weld.
3d打印之前，这将是一个不可能的形状，以铸造或焊接。
Special pattern was used to weld core iron to guarantee position accuracy of cast holes;
采用专用胎具焊接芯骨以保证铸孔的位置精度；
Special pattern was used to weld core iron to guarantee position accuracy of cast holes;
采用专用胎具焊接芯骨以保证铸孔的位置精度；
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