You'd need true nano-assemblers to do sub-cellular work. The ink-jet printer pulses out whole cells, laying them down in a computer controlled pattern.
I've seen film where a heart valve was produced on a dissolvable scaffold.
Picture tiny reservoirs or tubes leading to such reservoirs, isolated within the inkjet cartridge as colors usually are. Theoretically, one could lay down muscle, fat, bone, or blood vessel cells in specified patterns.
What it would take to scale this up to the ability to manufacture an organ is an exercise for the imagination.
My imagination says it may have to be done in a supportive oxygenated saline solution to keep the first layers alive while the rest of the structure is developed.
I wonder, Bob, isn't there a 3D fabricator copier now, and could the matrices be stratified to lay down varying lines of cells in layer upon layer as the 3D construct occurs? ... BTW, I'm using an already existing fluid and technology for 'oxygenation' in Evil Interrupted.