Fig. 9 shows a magnified view of the fracture surface of an injection molded ABS specimen. In most cases, the fracture of this thermoplastic component is ductile due to the reorientation and stretching of the thread-like macromolecules that allow for high levels of material deformation. Inthiscasethermoplasticsarebeinginvestigated,andsoone would expect to see typical ductile fracture characteristics in these specimens. Multiple craters and voids can be observed on the fracture surface. The fracture surface is nearly flat and without necking. Com- pared to the printed specimens, a significant difference in the size of porosities can be observed: circular cavities with diameters lower than 1μm are found in the molded specimen. Furthermore, the fracture surface of the molded specimen exhibits a number of cavities with a more uniform diameter distribution along the surfac