To make a 3-D model of a liver follow the instructions step by step here: http://www.ehow.com/how_5853546_make-human-liver-model.html
Good Luck and I hope this helps you successfully make a 3-D model of a liver! :)
How to make a 3-D model of a liver?
Bioprinting seems to be a common way for medical professionals to recreate 3d models of the liver.
Organovo’s NovoGen Bioprinting™ platform is the device of choice, and it produces high quality live tissue replicas using both parenchymal non-parenchymal cells in a a mathematically accurate models that replicate the role of organic liver tissue.