[stevewilhelm]

The laptop hinge is probably metal.

The top to my blender is made of two materials, a very soft pliable plastic that is food safe and a ridget clear plastic for the handle.

These two very simple examples have at least three very different materials with very different properties.

It is going to be one very expensive printer that could work with lots of different materials. Even if it could be made cheaply, small batches of each material in custom colors and sizes would also be very expensive.