Think about how your cells are arranged. How did it happen? Your trillions of cells, there function and position, were programmed by your genetic code and triggered by a combination of genetic and environmental factors. It was a slow organic process that happens once and it's a one way process. 3d printing renal cells prints globs of 1000s of cells in layers to make a kidney shape.
But a kidney is made of millions of nephrons which serve as the functional unit, the parts of which are one cell layer thick in many parts. Simply put, trying to 3d print the functional units of the kidney would be like a giant 3d printing nozzle the size of a NYC block spewing out heaps of random car parts by the thousands and hoping the parts self-assemble into a Ferrari engine.
The analogy breaks down in that a cell can conceivably self-assemble if given the right instructions. But this requires more understanding of stem cells and embryology. Despite all of the cell biology knowledge we have, we haven't scratched the surface of what amounts to a literal universe of information that describes the inner workings of a cell.
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