Additively manufactured semi-crystalline polymers such as polypropylene (PP) are known to show significant shrinkage and warpage. By filling PP with expanded-perlite, these phenomena can be reduced drastically. However, besides the printing quality, the structural integrity of such compounds is essential. Therefore, fracture mechanical tests were performed on shrinkage-optimized, 3D-printed PP. As the material behaves in a highly non-linear fashion even at very high testing rates, linear elastic fracture mechanical approaches are not applicable. Therefore, the crack resistance of the material in dependence of its strand orientation, namely 0/0°, 0/90° and 90/90°, was evaluated by means of a J-integral (an elastic plastic method) with 0.44, 0.32 and 0.27 kJ/m2, respectively. Hence, the shrinkage and warpage properties of 3D-printed semi-crystalline PP are significantly enhanced by the addition of perlite filler, but in return a relative low resistance against crack growth independently of the strand orientation was found.