A network (100) for replacement of a living tissue, said network is a scaffold-free artificial hollow biological tissue network comprising a plurality of longitudinal multicellular aggregates (11) arranged in a plurality of bioprinted layers (22) which are located on top of one another, further comprising an inner surface (20) and an outer surface (21), wherein at least one of said bioprinted layers (22) is in shape of a planar closed loop such that a conduit for conveying fluids is defined, and said longitudinal multicellular aggregate (11) is a mixture of at least two cell types. Also a method for obtaining said longitudinal multicellular aggregate, and a further method for biomodeling and planning said network are proposed.
