FDM (Short for "Fused Deposition Modeling") is an additive fabrication process which creates very strong parts from 3D Cad data. The materials used in FDM include ABS plastic, Polycarbonate (PC), Polyphenylsulfone (PPSU) and Wax.http://cadmodels.org/?q=FDM-Fused_Deposition_Modeling