3D Model Meso-Skeleton Correction for Additive Manufacturability
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Solution Overview
Problem
Additive manufacturing technologies face challenges in printing complex shapes with small features due to minimum printable feature size limitations, leading to poor quality or failed prints, as existing methods fail to adequately account for manufacturing constraints during the design stage.
Innovation Solution
A meso-skeleton analysis is applied to divide 3D object models into slices, using a thinning algorithm to reduce topological features smaller than the minimum printable size to skeletal paths, and then sweeping these paths with the minimum feature size to form corrected slices, which are assembled into a model suitable for additive manufacturing, while optimizing build direction to minimize shape modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a thinning algorithm is applied to reduce small topological features to skeletal paths, then additive manufacturability is improved, but the original shape fidelity deteriorates
Solution Approach 1:
The meso-skeleton analysis and thinning algorithm are applied during the design stage before manufacturing, allowing shape modifications to be made in advance. This preliminary action ensures that the model is pre-adjusted to meet manufacturing constraints, avoiding print failures while maintaining as much of the original design intent as possible.
Solution Approach 2:
The invention changes the geometric parameters of the model by reducing small topological features below the minimum printable feature size to skeletal paths. This parameter transformation makes the model compatible with additive manufacturing constraints while preserving the essential shape characteristics through controlled modification rather than complete redesign.
2Reliability
If the model is corrected to account for minimum printable feature size, then print quality improves, but the deviation from the original design increases
Solution Approach 1:
The thinning algorithm applies localized modifications only to regions where topological features are smaller than the minimum printable feature size. Areas of the model that already meet manufacturing constraints remain unchanged, preserving local design accuracy while ensuring print reliability only where necessary.
Solution Approach 2:
The invention applies partial modification by selectively thinning only the problematic small features rather than uniformly modifying the entire model. This partial action approach makes minimal changes to achieve printability while maintaining overall design fidelity in regions that do not require correction.
3Loss of substance
If build direction optimization is performed to minimize shape modifications, then material changes are reduced, but computational complexity increases
Solution Approach 1:
Build direction optimization is performed in advance during the design stage, evaluating multiple orientations and selecting the optimal build direction before manufacturing. This preliminary computational analysis minimizes material changes by choosing the best orientation, and the computational effort is incurred once rather than during iterative manufacturing trials.
Solution Approach 2:
The invention dynamically evaluates multiple build direction angles and selects the optimal orientation based on the meso-skeleton analysis. This dynamic approach allows the system to adaptively choose the build direction that minimizes shape modifications, with the computational complexity justified by the reduction in material waste and improved print success rate.
Data Source
AI summary
A three-dimensional object model is divided into a plurality of slices that are targeted for an additive manufacturing process having a minimum printable feature size. For each of the slices, a thinning algorithm is applied to one or more contours of the slice to form a meso-skeleton, where topological features of the thinned slice that are smaller than the minimum printable feature size are reduced to skeletal paths. A corrected slice is formed using the meso-skeleton by sweeping the meso-skeleton with the minimum printable feature size. The corrected slices are assembled into a corrected object model and the corrected object model is used in the additive manufacturing process.