Can humans be printed?
No.

Very early in the development of an organism, it is just a clump of cells.  Then those cells communicate, and determine where they are in the clump, which determines their eventual fate in the full organism.  In mammals, for instance, cells split into three different layers, and the skin and nerve cells develop from cells in the outermost layer...etc.

You can't just dump a bunch of stem cells somewhere and expect them to know where they are and what they should be developing into.