The researchers have already developed a prototype: it consists of a hydrogel and the living cell material, which can be printed as ink in a three-dimensional form. The tissue-like structure can be supplied with necessary nutrients and transport waste away.
The goal of the project is that such a 3D bio-printed organ will eventually be able to take over the functions of the natural pancreas like the production and secretion of insulin.
Source and more information:
https://www.klinikum.uni-heidelberg.de/newsroom/insulinproduzierende-zellen-aus-dem-3d-biodrucker/