The fourth step for finding out what it takes to 3D bio print an actual brain was to compile the notes that I found while researching the subject and people who are actively exploring the subject of 3D bio printing. I have found that researchers are 3D bio printing living brain tissue to eventually treat brain disorders, that there are people who are already working on steps to make 3D bio printing of functioning organs a real possibility by creating mini 3D structures of organs like the brain and liver that actually work and function like their real life counterparts would. I also found that the hardest part about 3D bio printing is not that the equipment is not in place to handle such an operation but that the materials themselves are the issue. When 3D printing objects that are non-living, it is easy because plastic, metal, wood, etc does not change – it does not die if left out in the open or is affected by the environment. However, living cells that are required for 3D bio printing are subject to dying if not in the optimal environment and is affected by many outside factors that inanimate objects are not affected by. http://www.cnn.com/2014/04/03/tech/innovation/3-d-printing-human-organs/