"3d-printing is limited by the need to additively deposit on top of existing layers." Not really, you can use another material as support, then dissolve it. "

"3d-printing is limited by the need to additively deposit on top of existing layers." Not really, you can use another material as support, then dissolve it. "How fast the production process is. Neither process is particularly fast, both are far behind injection molding." Well, if you consider that injection molding usually require WEEKS or MONTHS to get the first matrix mold done, then 3d printing is super fast.