Multicolour extrusion-based 3D print process
First Claim
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1. A 3D extrusion printer, comprising:
- a first printing head comprising a nozzle which receives a coated solid build material filament, melts the coated solid build material filament, thereafter applies the melted coated solid build material as print to a print bed;
a filament supply stream in communication with the first printing head which supplies a fixed coated solid build material filament to the first printing head;
a coating unit upstream to the first printing head on the filament supply stream which applies a coating to a solid build material filament;
a coating fixing region located between the coating unit and the first printing head;
a plurality of feed containers equipped with metering devices to supply a coating composition comprising at least one of an additive and an ink to the coating unit; and
a mixing unit between and in communication with the plurality of feed containers wherein the coating composition is mixed prior to being supplied to the coating unit; and
wherein the coating material applied to the filament in the coating unit is completely or incompletely fixed in the fixing region before entering the first printing head.
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Abstract
A 3D extrusion print process for producing multicolored three-dimensional objects is provided. The process produces mechanically stable, multicolored 3D objects with good color definition. The process according to the invention is based on coating, upstream of the printing head, of the polymer strand used for producing the actual object, and on fixing of the coating upstream of entry of the polymer strand into the printing head. Downstream of the extrusion process in the printing head, the coating remains predominantly at the surface of the extruded strand.
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Citations
13 Claims
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1. A 3D extrusion printer, comprising:
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a first printing head comprising a nozzle which receives a coated solid build material filament, melts the coated solid build material filament, thereafter applies the melted coated solid build material as print to a print bed; a filament supply stream in communication with the first printing head which supplies a fixed coated solid build material filament to the first printing head; a coating unit upstream to the first printing head on the filament supply stream which applies a coating to a solid build material filament; a coating fixing region located between the coating unit and the first printing head; a plurality of feed containers equipped with metering devices to supply a coating composition comprising at least one of an additive and an ink to the coating unit; and a mixing unit between and in communication with the plurality of feed containers wherein the coating composition is mixed prior to being supplied to the coating unit; and wherein the coating material applied to the filament in the coating unit is completely or incompletely fixed in the fixing region before entering the first printing head. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification