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Multicolour extrusion-based 3D print process

  • US 9,433,969 B2
  • Filed: 10/31/2013
  • Issued: 09/06/2016
  • Est. Priority Date: 11/09/2012
  • Status: Active Grant
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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