A method for molding, comprising: ordering, in a stack within a plunger cavity, first and second groups of preforms (216', 216", 316', 316"), each group comprising plural preforms (216', 216", 316', 316"), each preform (216', 216", 316', 316") comprising resin-coated fibers (216f', 216f", 316f', 316f"), wherein the first group of preforms (216', 316') and the second group of preforms (216", 316") differ from one another as to at least one characteristic; liquefying the resin; advancing a plunger (214, 314) through the plunger cavity to force, into a mold cavity (200', 200", 300'), fibers (216f', 216f", 316f', 316f") and resin from the two groups of preforms (216', 216", 316', 316"); and actuating, in sequence, a first vent and then a second vent (207-1, 207-3), wherein: the first vent is fluidically coupled to a first region of the mold cavity (200', 200", 300'), the second vent (207-1, 207-3) is fluidically coupled to a second region of the mold cavity (200', 200", 300'), actuation of the first vent results in preferential flow of fiber (216f', 216f", 316f', 316f") to the first region, actuation of the second vent (207-1, 207-3) results in preferential flow of fiber (216f', 216f", 316f', 316f") to the second region, and wherein the ordering of preforms (216', 216", 316', 316") in the stack and the sequencing of actuation of the vents (207-1, 207-2, 207-3) are coordinated so that fibers (216f', 316f') from the first group of preforms (216', 316') flow to the first region and fibers (216f", 316f") from the second group of preforms (216", 316") flow to the second region. ordering, in a stack within a plunger cavity, first and second groups of preforms (216', 216", 316', 316"), each group comprising plural preforms (216', 216", 316', 316"), each preform (216', 216", 316', 316") comprising resin-coated fibers (216f', 216f", 316f', 316f"), wherein the first group of preforms (216', 316') and the second group of preforms (216", 316") differ from one another as to at least one characteristic; liquefying the resin; advancing a plunger (214, 314) through the plunger cavity to force, into a mold cavity (200', 200", 300'), fibers (216f', 216f", 316f', 316f") and resin from the two groups of preforms (216', 216", 316', 316"); and actuating, in sequence, a first vent and then a second vent (207-1, 207-3), wherein: the first vent is fluidically coupled to a first region of the mold cavity (200', 200", 300'), the second vent (207-1, 207-3) is fluidically coupled to a second region of the mold cavity (200', 200", 300'), actuation of the first vent results in preferential flow of fiber (216f', 216f", 316f', 316f") to the first region, actuation of the second vent (207-1, 207-3) results in preferential flow of fiber (216f', 216f", 316f', 316f") to the second region, and wherein the ordering of preforms (216', 216", 316', 316") in the stack and the sequencing of actuation of the vents (207-1, 207-2, 207-3) are coordinated so that fibers (216f', 316f') from the first group of preforms (216', 316') flow to the first region and fibers (216f", 316f") from the second group of preforms (216", 316") flow to the second region. the first vent is fluidically coupled to a first region of the mold cavity (200', 200", 300'), the second vent (207-1, 207-3) is fluidically coupled to a second region of the mold cavity (200', 200", 300'), actuation of the first vent results in preferential flow of fiber (216f', 216f", 316f', 316f") to the first region, actuation of the second vent (207-1, 207-3) results in preferential flow of fiber (216f', 216f", 316f', 316f") to the second region, and wherein the ordering of preforms (216', 216", 316', 316") in the stack and the sequencing of actuation of the vents (207-1, 207-2, 207-3) are coordinated so that fibers (216f', 316f') from the first group of preforms (216', 316') flow to the first region and fibers (216f", 316f") from the second group of preforms (216", 316") flow to the second region.