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An apparatus and method for controlling the extrusion of thermoplastic through one or more discharge orifices is described. An apparatus comprises one or more thermally conductive flow tubes defining flow channels in a heated thermally conductive body and terminating in discharge orifices. Each flow

An apparatus and method for controlling the extrusion of thermoplastic through one or more discharge orifices is described. An apparatus comprises one or more thermally conductive flow tubes defining flow channels in a heated thermally conductive body and terminating in discharge orifices. Each flow channel may be independently valved on and off, by selectively supplying a flow of coolant. An array of flow channels can be independently opened and closed in a predetermined pattern, so as to vary the extrudate configuration of thermoplastic emerging from the discharge orifices. By extruding thermoplastic layer-by-layer onto a base in this manner, a three-dimensional object may be formed.

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An apparatus and method for controlling the extrusion of thermoplastic through one or more discharge orifices is described. An apparatus comprises one or more thermally conductive flow tubes defining flow channels in a heated thermally conductive body and terminating in discharge orifices. Each flow

An apparatus and method for controlling the extrusion of thermoplastic through one or more discharge orifices is described. An apparatus comprises one or more thermally conductive flow tubes defining flow channels in a heated thermally conductive body and terminating in discharge orifices. Each flow channel may be independently valved on and off, by selectively supplying a flow of coolant. An array of flow channels can be independently opened and closed in a predetermined pattern, so as to vary the extrudate configuration of thermoplastic emerging from the discharge orifices. By extruding thermoplastic layer-by-layer onto a base in this manner, a three-dimensional object may be formed. aim 1, wherein at least one incentive toy comprises a colored spinning disc. 8. The incentive inhaler device of claim 1, wherein at least one incentive toy comprises an acoustic device, the acoustic device being selected from a group consisting of a bi-directional siren, a bi-directional whistle, a uni-directional siren, and a uni-directional whistle. 9. The incentive inhaler device of claim 8, wherein the acoustic device is unidirectional and reversible attached such that in a first position sound is made upon inhalation and in a second position sound is made upon exhalation. 10. The incentive inhaler device of claim 1, wherein the valve is a one-way valve positioned within a conduit of the separator element that provides for an attachment of the incentive toy in sealable engagement with an interior wall of said conduit. 11. The incentive inhaler device of claim 10, wherein the conduit comprises at least three adaptor ends for connection of the respiration device, the connector and at least one incentive toy, and wherein at least one valve is positioned within the conduit in sealable engagement with the interior wall thereof at least one of said adaptor ends. 12. The incentive inhaler device of claim 11, wherein the one-way valve is positioned within the conduit in sealable engagement therewith and at an adaptor end that connects to the connector, such that a medicament can be drawn into the respiration device from the drug delivery device but not in an opposite direction. 13. The incentive inhaler device of claim 10, wherein the incentive toy is inhalation-driven, and the one-way valve is positioned within the conduit in sealable engagement therewith and at one end of said conduit that connects to said incentive toy, such that air can be drawn via said incentive toy and into the respiration device via the conduit but not in an opposite direction. 14. The incentive inhaler device of claim 10, wherein the incentive toy is exhalation-driven, and the one-way valve positioned within the conduit in sealable engagement therewith and at one end of said conduit that connects to said incentive toy, such that an exhaled air/medicament mixture can pass via said incentive toy from the respiration device but not in an opposite direction. 15. The incentive inhaler device of claim 10, further comprising at least one venturi comprising a frustoconical portion tapered at one end, said venturi being positioned: (i) coaxially within the conduit such that a circumference of an outer wall of said venturi is in sealable engagement with a circumference of the interior wall of the conduit; and (ii) sufficiently near to an end of said conduit that connects to the incentive toy such that a velocity of air is increased when it passes through said venturi thereby increasing a velocity of air passing from said venturi over or through said toy. 16. The incentive inhaler device of claim 10, further comprising a spacer unit positioned between the respiration device and the connector. 17. The incentive inhaler device of claim 1, wherein the separator element is positioned in sealable engagement with both the respiration device and the connector. 18. The incentive inhaler device of claim 17, wherein the connector comprises: an aperture at one end to sealably-engage the drug delivery device thereby minimizing leakage of a medicament between the connector and the drug delivery device linked thereto; and an end segment to releasably- and sealably-engage said connector to the separator element. 19. The incentive inhaler device of claim 18, wherein the end segment includes a snap-lock. 20. The incentive inhaler device of claim 1, further comprising a spacer unit positioned between the respiration device and the connector. 21. A connector for use with the incentive inhaler device of claim 1, comprising: a drug delivery receiving means comprising an aperture at one end to sealably-engage the drug delivery device such that minimum leakage of a medicament occ urs between the connector and the drug delivery device linked thereto; and an end segment to releasably- and sealably-engage said connector to a respiration device with which said connector is associated in the incentive inhaler device. 22. The connector of claim 21, wherein the drug delivery receiving means is flexible in order to conform to fit a variety of drug delivery ports. 23. The incentive inhaler device of claim 1 wherein the separator element is connected to the respiration device. 24. The incentive inhaler device of claim 1 wherein the separator element is connected to the connector. 25. The incentive inhaler device of claim 1 wherein the respiration device is a mouthpiece or mask. 26. The incentive inhaler of claim 1 wherein the separator element directs inhaled air to said toy. 27. The incentive inhaler of claim 1 wherein the separator element directs exhaled air to said toy. 28. An incentive inhaler device for administering an anaesthetic, comprising: a mask; a drug delivery tube that is linkable to a drug delivery device such that during inspiration there is a main inspiration flow of anaesthetic from the drug delivery device to the mask via said drug delivery tube; at least one incentive toy driven by exhaled air passing over said toy or through said toy wherein said toy has a visible characteristic or an audible characteristic; and a separator element comprising a conduit, wherein said conduit comprises three adaptor ends that are connected separately to said mask, said drug delivery tube and said incentive toy, and wherein said conduit comprises a one-way valve in sealing engagement with an interior wall of an adaptor end juxtaposed to the incentive toy to prevent a flow of inhaled air from the incentive toy to the mask and to separate said toy from said main inspiration flow of anaesthetic. 29. The incentive inhaler device of claim 28, further comprising a second one-way valve in sealing engagement with an interior wall of an adaptor juxtaposed to the drug delivery tube to prevent flow of exhaled air to the drug delivery tube. 30. The incentive inhaler device of claim 28, further comprising at least one venturi comprising a frustoconical portion tapered at one end, said venturi being positioned: (i) coaxially within the conduit such that a circumference of an outer wall of said venturi is in sealable engagement with a circumference of the interior wall of the adaptor end of the conduit juxtaposed the incentive toy; and (ii) sufficiently near to the incentive toy such that a velocity of air passing through said venturi is increased thereby increasing a velocity of air passing from said venturi over or through said toy. 31. The incentive inhaler device of claim 23, wherein the incentive toy comprises an exhalation-driven whistle and an exhalation-driven spinning disc. 32. The incentive inhaler device of claim 28, further comprising a scavenger pipe in engagement with the exhalation-driven incentive toy, such that exhaled air passing via said incentive toy is collected in a scavenger system comprising the scavenger pipe. 33. A method of operating an incentive inhaler device to administer an inhalable medicament to a child, comprising: (a) providing an incentive inhaler device comprising: (i) an inhalation device comprising a respiration device and a connector that is linkable to a drug delivery device such that there is a main inspiration flow of a medicament from said drug delivery device into said respiration device via said connector during inspiration by a child; (ii) at least one incentive toy coupled to the inhalation device, being driven by inhaled or exhaled air passing over said toy or through said toy, wherein said toy has a visible characteristic or an audible characteristic; and (iii) at least one separator element positioned so as to separate said toy from said main inspiration flow of a medicament and provide a separate air flow passage over or through said toy from or to outside