Printer system for developing a three-dimensional structure

1. A printer system for developing a three dimensional, printed structure, the system comprising:

a plurality of printheads arranged in groups, the printheads in each group being configured to print voxels of material to define a respective layer of the structure; and

a substrate configured to be operatively displaced with respect to each group so that printed voxels from each successive group can form successive layers of the structure upon the substrate,

wherein the groups are arranged consecutively along a direction of movement of the substrate, with each successive group positioned further from the substrate than a preceding group.

2. A printer system as claimed in claim 1 , wherein each printhead is configured to print a row of voxels such that the voxels are in a close pack hexagonal pattern.

3. A printer system as claimed in claim 1 , wherein each printhead is configured to print one of a polymeric material, a metal, a sacrificial material, and an evaporative drying material.

4. A printer system as claimed in claim 3 , wherein at least one printhead is configured to print one of Indium and an alloy of Indium and Gallium, to define the metal.

5. A printer system as claimed in claim 3 , wherein at least one printhead is configured to print a polymeric material with a melting point in the range of about 120° C. to 180° C.

6. A printer system as claimed in claim 3 , wherein at least one printhead is configured to print a wax having a melting point of above 80° C., to define the sacrificial material.

7. A printer system as claimed in claim 1 , in which each printhead includes two rows of nozzles, each printhead being configured so that one of the rows prints oddly numbered voxels while the other row prints evenly numbered voxels.