Cellular-Hull Infill Structure for Buckling-Resistant 3D Printing
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Solution Overview
Problem
Current additive manufacturing techniques, such as fused filament fabrication (FFF) 3D printing, face challenges in optimizing infill structures for strength and material efficiency, often resulting in structures that are prone to buckling and subject to high stresses due to traditional 'log-cabin' infill patterns.
Innovation Solution
A system that generates z-continuous infill structures with adjustable parameters like hull separation distance, cell size, and wall thickness, using isogrid or irregular polygon patterns between external and internal hulls, to create stronger 3D objects with reduced material usage, by simulating and optimizing structural properties to meet specified characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional log-cabin infill patterns are used, then the infill structure is simple to generate, but the resulting structure is prone to buckling and subject to high stresses
Solution Approach 1:
The infill structure is segmented into multiple cellular units arranged in grid patterns (isogrid, hexagonal, or irregular polygonal tessellations). Each cell acts as an independent structural element that distributes loads effectively, preventing the buckling issues seen in continuous log-cabin patterns while maintaining manufacturability through systematic generation.
Solution Approach 2:
The patent transitions from two-dimensional log-cabin layer patterns to three-dimensional cellular structures with vertical walls forming closed cells. This dimensional change creates hollow cellular compartments that provide superior structural strength and buckling resistance compared to traditional planar infill patterns.
2Strength
If infill material is increased to improve structural strength, then the object becomes stronger, but the material consumption increases
Solution Approach 1:
The cellular infill structure implements local quality by concentrating material in strategically positioned walls and cell boundaries rather than uniformly distributing infill throughout the volume. This creates regions of high structural efficiency where material is placed only where needed for strength and buckling resistance, reducing overall material consumption while maintaining or improving structural performance.
Solution Approach 2:
The patent creates a composite structure combining the external hull, internal hull, and cellular infill walls into an integrated composite system. This composite cellular architecture achieves superior strength-to-weight ratio compared to solid infill, as the hollow cell structure provides structural efficiency while minimizing material usage.
3Reliability
If wall thickness is increased to ensure continuous membrane formation, then structural integrity improves, but material consumption increases
Solution Approach 1:
The patent systematically varies wall thickness as a controllable parameter within the cellular structure generation process. By optimizing wall thickness values based on structural requirements rather than using uniform thick walls throughout, the system achieves reliable continuous membrane formation for structural integrity while minimizing material consumption through parameter optimization.
4Quantity of substance
If complex infill structures are generated to reduce material usage, then material efficiency improves, but the generation process becomes more complex
Solution Approach 1:
The patent implements a universal cellular structure generation system that can produce multiple infill patterns (isogrid, hexagonal tessellations, irregular polygonal tessellations) through a single standardized process framework. This multi-functional approach enables complex material-efficient structures to be generated systematically without requiring separate complex processes for each pattern type, reducing overall process complexity while maintaining material efficiency.
Data Source
AI summary
Methods, systems, and apparatus, including medium-encoded computer program products, for generating internal structures usable in additive manufacturing include, in at least one aspect, obtaining a three dimensional (3D) model of a 3D object to be manufactured by a 3D extrusion printer; defining an infill structure for the 3D model, wherein defining the infill structure comprises defining an internal hull separated from an external hull by a separation distance, wherein the external hull corresponds to the 3D model, and defining walls between the external hull and the internal hull to form cells between the external hull and the internal hull; and providing the 3D model and the infill structure for the 3D model to generate tool path data for the 3D extrusion printer to build the 3D object in accordance with the 3D model and the infill structure for the 3D model.