3D Printing Support Separation to Prevent Interface Micro-Cracks
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Solution Overview
Problem
Conventional 3D printing methods deposit support and body materials simultaneously, leading to a mixed interface that results in micro-cracks, reduced mechanical strength, and inferior surface quality, requiring costly post-processing to address issues like brittleness, part distortion, and non-uniform appearance.
Innovation Solution
A system and method where the 3D printing process introduces a delay between the deposition of body and support materials, using vertical shifts to separate them during printing, ensuring no mixed interface forms, resulting in a smoother surface with improved mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If support material and body material are deposited simultaneously in the same layer, then the printing process is efficient and fast, but micro-cracks are formed at the liquid-liquid interface leading to reduced mechanical strength and poor surface quality
Solution Approach 1:
The patent applies dimensionality change by separating the deposition of support material and body material into different vertical levels (Z-dimension) within the same layer. Instead of depositing both materials at the same height, the support material is deposited at one vertical position while the body material is deposited at a different vertical position, eliminating the liquid-liquid interface and preventing micro-crack formation while maintaining printing efficiency
2Ease of manufacture
If support material and body material are deposited simultaneously, then the printing process is simple and fast, but the surface becomes rough with micro-cracks requiring costly post-processing
Solution Approach 1:
The invention maintains process simplicity while improving surface quality by using vertical separation in the deposition process. The support and body materials are deposited at different heights within the same layer, creating distinct interfaces with the substrate rather than mixing with each other. This eliminates surface roughness and micro-cracks without adding complex post-processing steps
3Productivity
If support material is deposited at the same level as body material, then the printing process is efficient, but the printed parts exhibit increased brittleness and stress under load
Solution Approach 1:
The patent resolves the contradiction between deposition efficiency and structural reliability by separating support and body material deposition into different vertical levels. This spatial separation prevents the formation of weak liquid-liquid interfaces that cause brittleness, while maintaining efficient deposition through multi-level printing within the same layer, thereby improving structural reliability without sacrificing productivity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The approach significantly enhances the mechanical properties and appearance of printed parts by preventing direct contact between support and body materials, reducing micro-cracks and surface roughness, thereby improving dimensional stability and optical quality.
Implementation Method 1
material is selectively jetted from one or more print heads and deposited onto a fabrication tray in consecutive layers
Implementation Method 2
After the deposition the deposited layers are hardened (e.g., by ultraviolet (UV) curing)
Data Source
AI summary
A method of printing a three-dimensional (3D) object and a support construction for the 3D object includes depositing a model material, layer-by-layer, on a fabrication platform, to print a first portion of the 3D object, and depositing a support material, layer-by-layer on the fabrication platform, to print the support construction, wherein, in a predetermined number of the deposited layers, the model material and the support material are deposited such that a gap is formed between a surface of the first portion of the 3D object and a surface of the support construction.