
Why so many? Objet is pursuing the goal of being able to produce very unique objects with their devices, more so than their competitors. We think this is a natural result of their multi material capability in which they can load the 3D printer with two different materials. The materials can be not only different colors but different physical properties, too. Thus, you can produce objects with hard and soft portions, clear and opaque, etc.
Clearly this capability is vastly enhanced if you have a large selection of materials you can choose and use. That’s precisely what they’ve done.