3D Printing Infill Patterns for Strength and Speed
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Solution Overview
Problem
Existing three-dimensional printing techniques face challenges in achieving strength and dimensional stability while maintaining fast fabrication speeds, as current infill patterns often result in fragile objects or require excessive material and time.
Innovation Solution
The proposed infilling technique involves creating patterns with adjacent rows and columns, no sharp angle turns, and intersecting patterns at offset z-axis positions, with alternating rotations of the infill pattern by ninety degrees between layers, to enhance structural integrity and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the entire volume is filled with build material, then strength is improved, but build time and material usage increase
Solution Approach 1:
The patent applies porous infill patterns (such as gyroid, triply periodic minimal surface, and other lattice structures) that create a three-dimensional network of interconnected struts and voids. This porous structure provides adequate mechanical strength while significantly reducing material usage and build time compared to solid infill, directly resolving the contradiction between strength and productivity.
Solution Approach 2:
The patent combines different infill patterns in alternating layers (e.g., gyroid pattern in one layer, triply periodic minimal surface in the next) to create a composite infill structure. This composite approach optimizes both mechanical properties and build efficiency by leveraging the strengths of different patterns, achieving high strength-to-weight ratio while maintaining fast build speeds.
2Quantity of substance
If regular geometric patterns are used for infilling, then material usage is reduced, but object strength decreases
Solution Approach 1:
The patent employs sophisticated porous infill patterns with optimized strut arrangements and connection geometries that maintain structural integrity while minimizing material usage. These patterns create efficient load-bearing pathways through the infill volume, achieving high strength-to-material-ratio that outperforms conventional geometric patterns.
Solution Approach 2:
The patent transitions from two-dimensional planar infill patterns to three-dimensional volumetric patterns (such as gyroid and triply periodic minimal surface structures) that extend throughout the build volume. This dimensional transformation creates superior mechanical interlocking and load distribution, significantly enhancing strength while maintaining low material consumption.
3Productivity
If infill patterns include sharp angle turns, then fabrication speed may be maintained, but structural integrity and dimensional stability deteriorate
Solution Approach 1:
The patent replaces sharp angle turns with smooth curved transitions in the infill toolpaths. This curvature modification eliminates abrupt direction changes that cause printing artifacts and dimensional instability, while maintaining efficient material deposition. The smoothed paths reduce nozzle acceleration/deceleration cycles and improve layer adhesion, enhancing dimensional accuracy without significantly impacting build speed.
4Strength
If infill patterns are rotated ninety degrees between layers, then structural integrity is improved, but fabrication complexity increases
Solution Approach 1:
The patent implements periodic rotation of infill patterns at regular layer intervals (e.g., every other layer or every N layers). This periodic alternation between rotated and unrotated patterns, or between different pattern types, creates a woven-like structure that enhances mechanical properties in multiple directions while maintaining a predictable, manageable complexity that does not significantly increase fabrication difficulty.
Data Source
AI summary
In an aspect, infilling includes one or more the following characteristics: (i) adjacent rows and columns, which may be overlapping or non-overlapping; (ii) no sharp angle turns, i.e., no turns of ninety degree or less; and (iii) intersecting between infill patterns occurs from layer to layer (i.e., at offset z-axis positions). An infilling technique may also or instead include rotating the infill pattern about ninety degrees in some alternating fashion from layer to layer.