1. Smart 3D Printing Research Team, Korea Electrotechnology Research Institute (KERI), Changwon 51543, Korea
2. School of Materials Science and Engineering, Pusan National University, Busan 46241, Korea
3. Electrical Functionality Material Engineering, University of Science and Technology (UST), Changwon 51543, Korea
4. Department of Mechanical Engineering, The University of Hong Kong, Hong Kong 999077, China