3D Printing Model Adaptation for Self-Supporting Overhangs
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Solution Overview
Problem
3D printing technologies face challenges in forming overhang or undercut structures due to insufficient support from underlying layers, leading to material drooping or defects in the printed shape, particularly with steep walls or high overhang angles.
Innovation Solution
A method and system for adapting 3D printing models by calculating and modifying layer representation models to redefine boundary edges in overhang regions, ensuring local overhang angles remain below a predetermined threshold, allowing self-supporting structures without external support elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If external support elements are added to enable overhang structures with high overhang angles, then the manufacturability of complex geometries is improved, but the device complexity and material usage increase
Solution Approach 1:
The invention applies preliminary action by modifying the 3D model geometry before the printing process to pre-correct overhang issues. The method calculates overhang angles and modifies surface geometry in advance to ensure self-supporting structures, eliminating the need for external support elements during printing.
Solution Approach 2:
The invention applies local quality by selectively modifying only the regions with high overhang angles while leaving other parts of the model unchanged. The method identifies specific overhang regions and applies geometric modifications locally to those areas, preserving the overall design intent while ensuring printability.
2Stability of the object's composition
If external support elements are added to enable overhang structures, then the structural stability during printing is improved, but the material consumption and weight increase
Solution Approach 1:
The method performs preliminary geometric modification to create self-supporting structures that are inherently stable during printing. By adjusting surface geometry before printing, the structure gains inherent stability without requiring additional support materials.
3Adaptability or versatility
If the overhang angle exceeds the threshold, then the geometric design freedom is improved, but the manufacturing precision and quality deteriorate due to material drooping
Solution Approach 1:
The invention applies preliminary action by calculating overhang angles and modifying surface geometry before printing to prevent material drooping. The method proactively adjusts the model to ensure that all regions maintain adequate support, preserving manufacturing precision while allowing geometric design freedom.
Solution Approach 2:
The method applies local quality by selectively modifying only the problematic overhang regions while leaving other design features unchanged. This approach maintains manufacturing precision in critical areas without compromising overall geometric design freedom.
4Ease of manufacture
If support structures are added to enable steep walls, then the ease of manufacture is improved, but the production time and process complexity increase
Solution Approach 1:
The invention applies preliminary action by pre-modifying the geometry to create self-supporting structures. This eliminates the need to print and subsequently remove support elements, significantly reducing production time and simplifying the manufacturing process.
Data Source
Figure 1~7
AI summary
A method for adapting a 3D printing model includes calculating a layer representation model on the basis of a 3D object model of an object, the layer representation model being built up from a multitude of coplanar and confined adjacent layers, wherein the build-up direction corresponds to a printing direction of a 3D printing apparatus; determining a plurality of overhang regions in the layer representation model where the boundary edges of first layers extend over the boundary edges of second layers, the first layers being directly adjacent and subsequent to the second layers when going into the build-up direction of the layer representation model; determining a local overhang angle in each of the plurality of overhang regions, the local overhang angle being defined as the angle between the normal axis of the coplanar layers in build-up direction and the local tangent between the boundary edges of two adjacent layers; adapting the layer representation model by re-defining the boundary edges of layers in the overhang regions so that the local overhang angle remains below a predetermined overhang threshold angle; and outputting the adapted layer representation model as 3D printing model to the 3D printing apparatus.