3D-printing of polypropylene is a challenging task. The semi-crystallinity makes it difficult to create accurate objects. The gradient in cooling rate during printing means a gradient in shrinkage with internal stress and warping as a consequence. So the main question is: “Is it possible to print polypropylene?” Within this research, the behaviour of virgin polypropylene (PP) is characterized, more specifically the relationship between cooling, crystalline structure and shrinkage. A modified fused deposition modelling (FDM) machine is used to print a single filament of pure PP. The effect of different cooling programs on crystallinity/shrinkage is investigated. The cooling process can be divided into three steps: the quick cooling after the deposition of the filament, the heat set in the heated chamber and the cooling to room temperature. The percentage crystallinity and the crystal morphology are quantified by means of differential scanning calorimetry (DSC), polarisation optical microscopy (POM) and small angle laser scattering (SALS). For the quantification of the shrinkage of a single filament, a volumetric method is used. The same experiment is also performed using additives trying to minimalize the effect of shrinkage. Once the effect of the temperature control on crystallinity and shrinkage is known, optimization c