1. Centre for Additive Manufacturing (CfAM), The University of Nottingham, Nottingham NG7 2RD, UK;
2. Power Electronics, Machines and Control Group (PEMC), The University of Nottingham, Nottingham NG7 2RD, UK e-mail:
3. Centre for Additive Manufacturing (CfAM), The University of Nottingham, Nottingham NG7 2RD, UK e-mail: