Fiber-blended heterophasic copolymer for additive-manufacture feedstock

An additive-manufacture feedstock, comprising:

• a heterophasic copolymer having a melt flow rate of from 0.1 to 150 g/10 min (230° C./2.16 kg), measured according to ASTM D 1238, and
• a first-fiber blended in the heterophasic copolymer,
• wherein:
• the first-fiber is present in the additive-manufacture feedstock in an amount of from 1.0 to 40 wt %, relative to 100 wt % of the additive-manufacture feedstock, and
• the first-fiber-blended heterophasic copolymer, when in the form of a printed article, exhibits a warpage resistance rating of at most 1 mm, measured according to the following equation and 48 hours after printing the printed article:
• warpage
• ⁢
• resistance
• ⁢
• rating
• =
• ∑
• i
• =
• 1
• N
• WS
• i
• N
• wherein:
• Σi=1N WSi sums the values of WSi, starting at WS1 and ending with WSN,
• N is the total number of printed articles measured for warpage resistance rating evaluation,
• i is a ith printed article measured,
• WSi=Max (X1,X2,X3,X4)i−Min (Y1,Y2,Y3,Y4)i for a ith printed article measured,
• X1, X2, X3, and X4, respectively, represent a height of a first central edge, a height of a second central edge, a height of a third central edge, and a height of a fourth central edge, of the ith printed article measured,
• Y1, Y2, Y3, and Y4, respectively, represent a height of a first corner edge, a height of a second corner edge, a height of a third corner edge, and a height of a fourth corner edge, of the ith printed article measured,
• Max (X1,X2,X3,X4)i represents the maximum value of X1, X2, X3, and X4, for the ith printed article measured, and
• Min (Y1,Y2,Y3,Y4)i represents the minimum value of Y1, Y2, Y3, and Y4, for the ith printed article measured,
• wherein each printed article measured for warpage resistance rating evaluation is a 60 mm×60 mm×60 mm cubic box, each side of the cubic box having a thickness of 1 mm.