| 摘要 |
In an exemplary implementation of this invention, a plurality of materials are heated, mixed and extruded from a nozzle. The ratio of materials in the extruded mixture may be dynamically varied in such a way that the composition of the extruded material varies in a substantially continuous gradient. The deposited material is selectively deposited layer by layer. The composition of the resulting 3D object may vary, over at least part of its volume, in a substantially continuous gradient. Furthermore, a plurality of such nozzles may be employed, at least one of which extrudes support material and at least one of which extrudes parts material, in each case in such a way that the composition of the extruded material varies in a substantially continuous gradient.
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