Guidelines 130 in FIG. 4 show how a portion of formed part 126 in FIG. 4A removes from a portion of the grooved pattern in form tool 128 in FIG. 4B. It is equally feasible to form bin part 126 by any appropriate direct forming methods such as for example, chemical etching, electro-discharge machining, and depending on the actual bin size, wire electro-discharge machining.