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A system and method to fabricate three dimensional objects. A set of fabrication tools include at least a coarse deposition head and a fine additive head, a fine subtractive head or both employed concurrently within a single housing. A scanner may also be used within the housing to perform interleav

A system and method to fabricate three dimensional objects. A set of fabrication tools include at least a coarse deposition head and a fine additive head, a fine subtractive head or both employed concurrently within a single housing. A scanner may also be used within the housing to perform interleaved scanning of the partial fabrication during the fabrication. The process may be adjusted based on the scan results.

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1. A three dimensional printing apparatus comprising: a structure defining a work area;an interface to receive digital data defining a geometry for a three-dimensional object to be fabricated;at least two different additive nozzles that deposit different volumes of material per unit of time at each

1. A three dimensional printing apparatus comprising: a structure defining a work area;an interface to receive digital data defining a geometry for a three-dimensional object to be fabricated;at least two different additive nozzles that deposit different volumes of material per unit of time at each nozzle's spot of deposition, one nozzle depositing at least twice as much as the other, the two nozzles including:a coarse additive nozzle that deposits a larger volume of material per unit of time within the work area;a fine additive nozzle that deposits a smaller volume of material per unit of time at a spot within the work area; anda controller configured to select between the coarse additive nozzle and the fine additive nozzle during a build process based on the digital data defining the geometry, to cause large features internal to the three-dimensional object to be built with the coarse additive nozzle more rapidly than is possible with the fine additive nozzle. 2. The three dimensional printing apparatus of claim 1 wherein the fine additive nozzle comprises a nozzle having a spot deposit granularity less than 0.015 square inches at a point of deposition. 3. The three dimensional printing apparatus of claim 1 wherein the coarse additive nozzle has a spot deposit granularity greater than 0.030 square inches at a point of deposition. 4. The three dimensional printing apparatus of claim 1 further comprising: temperature control subsystem to actively cool a portion of the deposit of material more rapidly than an intrinsic cooling rate of the material. 5. The three dimensional printing apparatus of claim 1 further comprising: a three dimensional scanner coupled to the structure to capture three dimensional data about the three-dimensional object being fabricated; anda control subsystem that monitors scan head data and controls the coarse additive fine additive nozzles to adjust a fabrication process to improve at least one of the speed or accuracy of a fabrication of the three-dimensional object. 6. A three dimensional printing apparatus comprising: a structure defining a work area;an interface to receive digital data defining a geometry for a three-dimensional object to be fabricated;a coarse nozzle to deposit material at a coarse granularity within the work area; andat least one of a fine granularity additive nozzle or a fine granularity subtractive head to detail the material deposited by the coarse nozzle; anda control subsystem that includes a software module configured to determine whether access to detail will be possible after a subsequent layer of material is deposited, and whether the fabrication of the three-dimensional object will be more efficient per unit of time when the detailing is deferred to a point of later time in the fabrication. 7. The three dimensional printing apparatus of claim 6 wherein the subtractive mechanism comprises: a computer-controlled milling bit.