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Apparatus and methods for servicing 3D printers

  • US 7,824,001 B2
  • Filed: 11/30/2004
  • Issued: 11/02/2010
  • Est. Priority Date: 09/21/2004
  • Status: Active Grant
First Claim
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1. A method of determining and applying correction factors for aligning a plurality of printheads, the method comprising:

  • printing a test pattern on a build surface;

    analyzing the test pattern to determine a harmonic content thereof at at least one frequency; and

    determining correction factors based on the harmonic content of the test pattern, herein a correction factor is determined by locating a minimum value of an analytical curve that has been fitted to a representative set of harmonic content values determined for a range of nominal test bar displacements; and

    adjusting timing of a firing signal to at least one of the plurality of pintheads based on at least one correction factor,wherein the correction factors are determined from a set of third harmonic content values.

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