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We were doing it back in 1999 at UW. You don't need to 3d print it - you need to lay down a lattice made of fiber small enough that the cells don't see it as foreign material. Don't see it as foreign material? It doesn't reject. Lattices of nanofiber laid over burns would grow skin in some trials - not scar tissue, which is devoid of follicles, pores or any other functional dermal structures, but good, pure, epidermis. The fact that we were there in 1999 and you still haven't seen it commercially should say something about the difficulty of bioengineering.