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1. A method of printing a first three-dimensional object, comprising: inserting an array of injection printheads into a container to an initial depth; depositing a quantity of fill material into the container around the injection printheads; retracting the injection printheads to a first retraction depth within the container; depositing a print material into the fill material via a selection of the injection printheads at the first depth, wherein the deposited print material completely displaces the fill material at locations of deposition and the fill material acts to support and prevent the print material from deforming in the locations of deposition; retracting the injection printheads to each of a plurality of successive retraction depths within the container; depositing the print material into the fill material via various combinations of the injection printheads at each of the successive retraction depths within the container, wherein the deposited print material completely displaces the fill material at locations of deposition at each of the successive retraction depths and the fill material acts to support and prevent the print material from deforming in the locations of deposition at each of the successive retraction depths; allowing the print material to lock; and removing the entire quantity of fill material after the print material is locked.
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