there's also a process where, think of an object being printed with tape, you layer by layer tape on top of eachother until the object appears from all those layers

this process is called 'laminated object manufacturing' and its not very popular, but can be use with materials like plastic films, foils, paper, flat stuff, there's a bit of waste tho, because the shape of the layered material comes from a roll of that material, so its truly an 'additive' process although you do add materials to make your parts.

cost is probably in the thousands due to low cost materials