Polypropylene for extrusion additive manufacturing

A process for producing an article with an extrusion-based additive manufacturing system comprising the step of:

• extruding a flowable build material in the form of filament to produce strands, drops or beads, wherein the filament comprises a propylene polymer composition comprising:
• A) from 20% to 60% by weight of a heterophasic propylene copolymer;
• B) from 5% to 33% by weight of a propylene homopolymer or copolymer, wherein the copolymer contains up to 5% by weight of an alpha olefin selected from the group consisting of ethylene, 1-butene, 1-hexene and 1-octene;
• C) from 2% to 15% by weight of an elastomeric block copolymer comprising styrene;
• D) from 4% to 32% by weight of an elastomeric ethylene copolymer;
• E) from 5% to 50% by weight of a glass material as filler;
• and
• F) from 0.1% to 5% by weight of a compatibilizer,
• wherein the amounts of components A), B), C), D), E) and F) are referred to the total weight of A), B), C), D), E) and F), which amounts to 100% and wherein the melt flow rate MFR at 230° C. with a load of 2.16 kg, according to ISO (International Organization for Standardization) 1133-2:2011, is at least 1.0 g/10 min.;
• and
• fusing the strands, drops or beads to form the article.