HumanPenguin , 4 hours ago

3D printing is a broad subject. Covering most materials.

It is just current home printing that is mainly plastics. Because the cost rises with other materials. Plastics allows $200 or more printers.

But it dose not have to stay bad. We are starting to see more and more research into effective plastic replacements. And the expansion of cheap 3d printing can theoretically speed up the distribution of those alternatives.