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Apparatus and methods for servicing 3D printers

  • US 8,167,395 B2
  • Filed: 10/19/2010
  • Issued: 05/01/2012
  • Est. Priority Date: 09/21/2004
  • Status: Active Grant
First Claim
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1. A method of creating a test pattern with a plurality of printheads of a three-dimensional printer, the method comprising:

  • defining an area on a build surface for receiving the test pattern, by printing a contrast-enhancing sublayer on the build surface by (i) spreading a layer of build material on the area of the build surface, (ii) printing the area on the build material layer in a solid, high contrast color using at least one printhead and (iii) overlaying the printed area with at least one unprinted layer of build material;

    selecting a reference printhead capable of printing with a high contrast;

    printing a plurality of reference lines with the reference printhead on the unprinted layer of build material;

    printing a plurality of test lines proximate to the reference lines with at least one of the remaining printheads; and

    scanning the test and reference lines to determine a deviation of at least one of the test lines from a desired position by determining a harmonic content of the test and reference lines of at least one frequency.

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