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A head tool changer for use with a deposition-based digital manufacturing system, the head tool changer comprising a tooling unit configured to retain a deposition head, a grip unit configured to engage with tooling unit and to relay electrical power to the tooling unit, and a master unit operably m

A head tool changer for use with a deposition-based digital manufacturing system, the head tool changer comprising a tooling unit configured to retain a deposition head, a grip unit configured to engage with tooling unit and to relay electrical power to the tooling unit, and a master unit operably mounted to a gantry and configured to engage with the tooling unit and to relay electrical power to the tooling unit.

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1. A head tool changer for use with a deposition-based digital manufacturing system for building layer-based three-dimensional models, the head tool changer comprising: a tooling unit configured to retain a deposition head of the deposition-based digital manufacturing system;a master unit operably m

1. A head tool changer for use with a deposition-based digital manufacturing system for building layer-based three-dimensional models, the head tool changer comprising: a tooling unit configured to retain a deposition head of the deposition-based digital manufacturing system;a master unit operably mounted to a gantry of the deposition-based digital manufacturing system, the master unit being configured to detachably engage with the tooling unit and to relay electrical power to the tooling unit;an actuator assembly operably mounted to the deposition-based digital manufacturing system, wherein at least a portion of the actuator assembly is configured to move along an axis toward the master unit; anda grip unit secured to the actuator assembly and configured to detachably engage with the tooling unit and to relay electrical power to the tooling unit;wherein the relay of electrical power from the grip unit to the tooling unit is configured to be cut upon the tooling unit being disengaged from the grip unit and being engaged with the master unit. 2. The head tool changer of claim 1, wherein the tooling unit is further configured to relay the electrical power received from the grip unit to the deposition head when the deposition head is engaged with the grip unit, and wherein the tooling unit is further configured to relay the electrical power received from the master unit to the deposition head when the deposition head is engaged with the master unit. 3. The head tool changer of claim 1, wherein the grip unit and the master unit are each further configured to relay control signals to the tooling unit. 4. The head tool changer of claim 1, wherein the tooling unit comprises: a first electrical contact configured to receive at least a portion of the electrical power relayed from the grip unit; anda second electrical contact configured to receive at least a portion of the electrical power relayed from the master unit. 5. The head tool changer of claim 4, wherein the grip unit comprises: an electrical lead configured to receive the electrical power relayed to the tooling unit from the head tool changer; anda third electrical contact conductively connected to the electrical lead and configured to engage with the first electrical contact of the tooling unit. 6. The head tool changer of claim 4, wherein the master unit comprises: an electrical lead configured to receive the electrical power relayed to the tooling unit from the deposition-based digital manufacturing system; anda third electrical contact conductively connected to the electrical lead and configured to engage with the second electrical contact of the tooling unit. 7. The head tool changer of claim 1 further comprising a tool rest assembly operably mounted to the deposition-based digital manufacturing system, the tool rest assembly configured to engage with the tooling unit. 8. The head tool changer of claim 7, wherein the tool rest assembly comprises a purge trap that is configured to be operably connected to a vacuum line. 9. The head tool changer of claim 7, wherein the tool rest assembly is further configured to relay electrical power and control signals to the tooling unit when engaged with the tooling unit. 10. A head tool changer for use with a deposition-based digital manufacturing system for building layer-based three-dimensional models, the head tool changer comprising: a plurality of tooling units, each tooling unit being configured to retain a respective deposition head of the deposition-based digital manufacturing system;a master unit operably mounted to a gantry of the deposition-based digital manufacturing system, wherein the tooling units are configured to interchangeably engage with the master unit such that only one of the plurality of tool units engages the master unit at any given time;a plurality of actuator assemblies operably mounted to the deposition-based digital manufacturing system, wherein at least a portion of each of the plurality of actuator assemblies is configured to move along an axis toward the master unit; anda plurality of grip units, wherein each grip unit is secured to one of the plurality of actuator assemblies, each grip unit being configured to detachably engage with one of the plurality of tooling units;wherein the grip units are each configured to relay electrical power to the respective tooling unit attached thereto, and wherein the relay of electrical power from one of the grip units to the respective tooling unit attached thereto is configured to be cut upon the respective tooling unit being disengaged from the one grip unit and being engaged with the master unit. 11. The head tool changer of claim 10, wherein the electrical power relayed from each grip unit to the respective tooling unit attached thereto is configured to power the deposition head secured to the respective tooling unit. 12. The head tool changer of claim 11, wherein each grip unit is further configured to relay control signals to the respective tooling unit attached thereto, the relayed control signals being configured to operate the deposition head secured to the respective tooling unit. 13. The head tool changer of claim 10, wherein the master unit is configured to relay electrical power to one of the plurality of tooling units at a given time, the relayed electrical power being configured to power the deposition head secured to the one tooling unit. 14. The head tool changer of claim 10, wherein each tooling unit comprises: a first lock component configured to lock with a portion of the respective grip unit attached thereto; anda second lock component configured to lock with a portion of the master unit.