A vacuum forming roll is assembled from a large plurality of radially extensive interlocking segments. Each segment forms a small angular part of a circumference about the roll, and has a relatively small thickness parallel to the longitudinal axis of the roll. The segments are preferably stacked together in an interlocking fashion to form a continuous roll consisting of a plurality of angularly offset circumferential rings. In a preferred embodiment, the segments are formed by manufacturing a small mold designed to form a single segment. This mold may, for exemplary purposes, be an injection mold. The roll mold segments may then be produced quickly and easily using an injection molding process, which, as aforementioned, is efficient for the production of a large number of identical components. The roll mold segments are then assembled to form the roll mold, which is in turn used to shape and perforate a plastic film and thereby manufacture an improved landscape fabric economically. A variety of shapes, geometries and operations for the segments and molds are described.