Polypropylene is one of the most widely used general plastics in daily life and industry. It is not only with a balanced rough/rigid property, but also easily processed. Its moulding methods consists of injection molding, blowing molding, casting, rotational moulding, biaxial stretching and the like. 3D printing is the hottest state of art technology and covers a variety of materials. However, as general-purpose plastics, there are numerous obstacles for polypropylene applied in 3D printing. High shrink of polypropylene is the major difficulty that limits its use in FDM technique. In the paper, impact, homo-, and random polypropylene were investigated when they were applied in FDM processing. Obviously, these three types of polypropylene have distinctly different molecular structures and crystallization behaviors. For impact polypropylene, filler and petroleum resin are efficient additives in reducing the shrinkage of polypropylene at the cost of weakending mechanical property to some extent. For random polypropylene, filler and nucleating agents were checked respectively on their impact on reducing shrink phenomenon. The synergistic effect of filler and petroleum resin were feasible in r-PP system as well. After modification by fill and petroleum resin, the shrinkage rate of PP was reduce by 21% (MD) and 24% (TD). The dosage of nucleating agents was constricted to certain content and higher dosage is useless. The mechanical properties of printed samples could be improved by adjusting the printing conditions, such as bed temperature, the size of nozzle, the filing density and so forth. In terms of material itself, the physical characteristics, such as melting point, Tg, melt viscosity, are significant parameters in determining the printing performance.