also shows an internal pipe 70 with a vacuum port 72 and a bearing surface 74 the pipe 70 is located in the center of the drum 100 the pipe 70 also has a slot 73 that is in communication with the vacuum port 72 to draw a negative pressure 75 through a sector of the drum 100 to conform the solidifying filaments to the contour see fig7 also shown is v belt drive 76 which can be used to rotate the drum 100 by any conventional source known to those skilled in the art such as a variable speed motor referring to fig3 c the drum 100 includes inner support bars 78 which are located throughout the drum 100 the inner support bars 78 provide stiffness to the drum 100 and allow a negative pressure 75 or positive pressure 79 to be provided to a portion of the drum 100 as shown in fig7 fig3 c also shows that the drum 100 includes a plurality of panels 80 that can attached to the drum 100 by a variety of means e g fasteners or clips the panels 80 can be made of honeycomb with a microporous outerlayer to form any desired contoured outer surface 102 referring to fig4 shown is a partial cross sectional view of one embodiment of the drum 100 of the present invention the drum 100 has a contoured outer surface 102 that has the shape of alternating peaks 110 and valleys 112 the contoured outer surface 102 is covered by the microporous layer 106 as will be further shown the contoured outer surface 102 with alternating.