?? ?????? ???????.Beijing SANDI Technology Co.????? ???? ??? ??? ????? ??????? ????? ????? ????? ??????? 3DP???? ???? Xinxin Casting ?? ????? ??????? ?? ????? ?????????? ????? ????? ???? 2.5 ??? ???? 1 ?? ????? ?? ???? ?????? ???????. ????? ?? ?????? ?? ??? ??? ????? ?????? ???????? ????? ???? ????????? ????? 60 ????? ???????? ????? ?????? ?? ?????? 40 ????? ??? ?????? ???????.

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