1. Topology Optimization Group, Civil Engineering Department, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218 e-mail:
2. Design, Research, and Education for Additive Manufacturing Systems Laboratory, Virginia Tech, Randolph Hall, 460 Old Turner Street, Blacksburg, VA 24061 e-mail:
3. Mem. ASME Design, Research, and Education for Additive Manufacturing Systems Laboratory, Virginia Tech, Randolph Hall, 460 Old Turner Street, Blacksburg, VA 24061 e-mail:
4. Mem. ASME Topology Optimization Group, Civil Engineering Department, Johns Hopkins University, 3400 N. Charles Street, Baltimore, MD 21218 e-mail: