Lin Lu 0001 Andrei Sharf Haisen Zhao Yuan Wei Qingnan Fan Xuelin Chen Yann Savoye Changhe Tu Daniel Cohen-Or Baoquan Chen Build-to-last: strength to weight 3D printed objects. 97:1-97:10 2014 33 ACM Trans. Graph. 4 https://doi.org/10.1145/2601097.2601168 db/journals/tog/tog33.html#LuSZWFCSTCC14