Right now, it's easier to scan than to simulate.

That said, we definitely don't have the means to 3D print even relatively simple tissues, last I checked we are still limited to structures thin enough to be kept alive by oxygen diffusion.

One of my open questions on this topic is: given we can cryopreserve small tissue without the freezing-damage problem, why can't we do a repeated process of:

1. cell culture tissue sheets that are ~1mm (or whatever) thick

2. cryopreserve each sheet

3. then assemble those sheets, still frozen

4. then thaw out as per normal procedure for cryopreserved organs

Caveat: I have minimal knowledge of biology, this may be a stupid idea for a whole bunch of reasons I don't even know the names of.

Simulations still need to run on something & need energy to power them. The better, more stable, higher fidelity simulation you want, the more mass & energy it will need. And that needs to come from somewhere - a thing many infomorphs tend to conveniently forget far too often.