3D Printing Indexing Method for Nozzle Defect Compensation
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Solution Overview
Problem
3D printing systems with powder beds and liquid jetting systems face nozzle-oriented defects such as blocked nozzles, drop ejection directionality differences, and color concentration variations, leading to reduced print quality and increased costs due to the need for redundant nozzles and time-consuming defect detection.
Innovation Solution
Implementing a multiple pass indexing method where the printhead or build platform is indexed orthogonally between passes to ensure complete coverage of the build platform, allowing different nozzles to address missed areas and reduce the need for redundant nozzles, thereby improving print quality and reducing costs and printing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant nozzles are added to compensate for nozzle defects, then print reliability is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies indexing in the orthogonal direction (Y-axis) to distribute nozzle usage across multiple passes. Instead of adding redundant nozzles in the same dimension, the system moves the printhead to different positions orthogonally, allowing different nozzle subsets to cover the build platform across multiple passes. This dimensional approach to redundancy eliminates the need for additional nozzles while maintaining print reliability.
2Manufacturing precision
If nozzle defect detection and servicing is performed, then print quality is improved, but printing time increases
Solution Approach 1:
The system performs preliminary indexing and nozzle distribution planning before the actual printing process. By pre-calculating and pre-positioning the printhead at different indexed locations for different passes, the system ensures complete coverage without requiring post-printing nozzle detection or servicing. The indexing strategy is established in advance, eliminating time-consuming defect detection steps.
3Productivity
If single pass printing is used, then printing speed is improved, but manufacturing precision deteriorates due to nozzle defects
Solution Approach 1:
The printing process is segmented into multiple passes, each responsible for covering specific regions of the build platform. By dividing the build platform into zones and assigning different nozzle subsets to different zones across multiple passes, the system maintains high printing speed while ensuring complete and accurate coverage. Each pass is optimized for its specific region, preventing nozzle defects from compromising overall print quality.
Data Source
AI summary
In an example implementation, a method of printing a three-dimensional (3D) object includes scanning a print bar in a first direction over a build platform of a 3D printer to deposit a liquid agent onto a layer of build powder. The print bar is then indexed in a second direction substantially orthogonal to the first direction before scanning the print bar back over the build platform in a third direction opposite the first direction to deposit additional liquid agent onto the layer of build powder.