Printer system for developing a 3-D product

1. A printer system for developing a three dimensional (3D) printed structure, the system comprising:

a plurality of spaced apart sets of printing devices; and

a conveyor system arranged to serially convey a print medium operatively with respect to each set so that printed voxels from each successive set can form successive layers of the 3D printed structure upon the print medium;

wherein the printing devices are arranged so that each successive set is located further from the conveyor than any preceding set.

2. A printer system as claimed in claim 1 , wherein each set includes a plurality of like printing devices arranged in a row.

3. A printer system as claimed in claim 2 , wherein all of the printing devices in each set are configured to print voxels of material concurrently.

4. A printer system as claimed in claim 1 , wherein each set is a singleton set containing exactly one printing device.

5. A printer system as claimed in claim 1 , wherein the material printed by a row of each set comprises any one of the following group: a polymeric material, a metallic material, a sacrificial material, and an evaporative drying material.

6. A printer system as claimed in claim 5 , wherein the metallic material is any one of the group of: Indium and an alloy of Indium and Gallium.

7. A printer system as claimed in claim 5 , wherein the polymeric material has a melting point in the range of about 120° C. to 180° C.

8. A printer system as claimed in claim 5 , wherein the sacrificial material comprises a wax having a melting point of above 80° C.