please don’t limite your design when you design a plastic part, because it Increases your design options and requirements and still keep costs down, and plastic is easy in producing complex shapes. you know, when we design a metal product, there are many many design limitations
if we put several metal stampings or castings fastened together, the additional assembly cost will be generated, but a single injection molded part incorporating the features of the total assembly will meet your requirement. Even we need multiple assemblies, snap-together features of the plastic parts can eliminate any fasteners.
In today’s market, time is a very important facter, especially for a new product development, Injection molded parts just can shorten the time to the market place, because they are easily processed into complex shapes with high quality, but it would be impossible for metal parts.