Abstract: A method comprising, (i) providing a thermoplastic material comprising 5-75 wt % of a post-consumer recycled polyolefin composition and 25-95 wt % of an olefin block copolymer composition based on total weight of the thermoplastic material, wherein the post-consumer recycled polyolefin composition comprises at least 50 wt %, of a polyolefin and at least 0.1 wt % of a contaminant; (ii) heating and dispensing said thermoplastic material through a nozzle to form an extrudate deposited on a base, (iii) moving the base, nozzle or combination thereof while dispensing the thermoplastic material so that there is horizontal displacement between the base and nozzle in a predetermined pattern to form an initial layer of the material on the base, and (iv) repeating steps (ii) and (iii) to form a subsequent layer of the material adhered on the initial layer, and (v) optionally repeating step steps (ii) and (iii) to form additional subsequent layers.

Abstract: A method of fused filament fabrication (FFF) additive manufacturing comprises employing an olefin block copolymer. The method allows for the additive manufacturing article that retains the desirable mechanical properties of polyolefins such as polyethylene or polypropylene without experiencing the problems inherent in FFF printing of polyethylene or polypropylene particularly in the absence of solid fillers. In a particular embodiment, the additive manufactured article is comprised of the olefin block copolymer is comprised of block composite or crystalline block composite polymer or mixture thereof comprising the olefin block copolymer, wherein the olefin block copolymer is comprised of an isotactic propylene block and a polyethylene rich block.