The present disclosure relates to a method for placing cellular material in a bioink, gel or hydrogel material for subsequent 3D-bioprinting. The method comprises bioprinting or dispensing (S10) at least one layer of bioink/gel/hydrogel. The method also comprises dispensing or patterning (S20) cellular material in the form of single cells, spheroids or cell suspension on or in the bioink/gel/hydrogel layer using a micro fluidic device. The method additionally comprises repeating (S30) said previous steps in order to create a 3D tissue model with multiple cell layers.The present disclosure also relates to corresponding micro fluidic devices, computer programs and 3 D bioprinters .
