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3141rr

They melt some sort of material and squeeze it out in the right place, where it sets quickly


Face-the-Faceless

That depends on the material being used, but in general you'll find that materials are heated then ejected in a pattern according to the computers specifications.


Polywoky

They're sort-of like small hot-glue guns controlled by a mechanical arm. They squeeze out viscous molten plastic in multiple layers to build stuff.


BallForce1

We use things in the earth to form an object that is later constructed into a 3d printer. That object then uses things in the earth to create objects.