Direct Investment Casting For Pattern Developed By Desktop 3D Printer O.M.F. Marwah, M.S. Shukri, E.J. Mohamad, M.A. Johar, R.H.A. Haq and R.K. Khirotdin MATEC Web Conf., 135 (2017) 00036 Published online: 20 November 2017 DOI: 10.1051/matecconf/201713500036