Full-Color 3D Printing via Grayscale Support Material Patterns
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Solution Overview
Problem
Current 3D printing systems for multi-colored and full-color applications are often expensive and complex, requiring multiple print heads and channels, which limits their accessibility and efficiency.
Innovation Solution
A method that uses a single print head with two or four channels to deposit build materials and a support material in a fluid state, where the support material forms a grayscale or CMY color pattern between layers, enabling full-color printing with reduced complexity and cost, and providing improved color resolution and texture options.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple print heads and/or print heads having a plurality of printing or material channels are used to form multi-colored 3D articles, then color capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent segments the color printing function into two parts: (1) a single print head handles the physical deposition of colored build material in grayscale, and (2) a separate computational layer performs CMYK color separation and voxel mapping to assign appropriate grayscale values. This segmentation allows the hardware to remain simple while the software provides advanced color capability.
Solution Approach 2:
The patent introduces an intermediary computational process that converts full-color images into grayscale 3D models with embedded color information. This intermediary layer (the color separation algorithm) acts as a mediator between the color input image and the grayscale print head, enabling color output without requiring a color-capable print head.
2Adaptability or versatility
If multiple print heads and/or print heads having a plurality of printing or material channels are used to form multi-colored 3D articles, then color capability is improved, but cost increases
Solution Approach 1:
The patent employs a standard, widely available grayscale 3D printer instead of expensive specialized color 3D printers. By using a common, inexpensive print head that can be obtained from ordinary inkjet or 3D printing suppliers, the system avoids the high cost of proprietary color printing hardware while achieving full-color output through software-based color separation.
Solution Approach 2:
The patent changes the parameter space by representing color information not through multiple material channels (hardware parameter) but through grayscale intensity values (software parameter). Each voxel stores color data in the form of grayscale levels that correspond to CMYK component values, allowing color reproduction through a single material channel.
3Reliability
If support material is deposited between build material regions of differing colors, then structural support during printing is improved, but color resolution and color-to-color diffusion control are worsened
Solution Approach 1:
The patent applies local quality by making the support material's optical properties spatially variable. The support material is rendered transparent or matching in color to the surrounding build material in specific local regions, allowing it to remain visually imperceptible. This is achieved by analyzing the color of adjacent build material voxels and adjusting the support material's grayscale value accordingly, so that support structures do not create visible artifacts or color diffusion at color boundaries.
Solution Approach 2:
The patent dynamically changes the color (grayscale value) of the support material based on its local environment. By computing the average color of surrounding build material voxels and setting the support material's grayscale value to match, the support structures blend seamlessly with the colored build material, preventing visible color diffusion and maintaining high color resolution at interfaces.
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
This method allows for the creation of high-resolution, full-color 3D printed articles using fewer and less complex printing systems, reducing material and equipment costs while enhancing visual effects and color accuracy.
Implementation Method 1
selectively depositing a first portion of support material in a fluid state to form a first region of support material
Implementation Method 2
use inks, which are also known as build materials, that are jetted through a print head as a liquid
Data Source
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AI summary
In one aspect, methods of printing a 3D article are described herein. In some embodiments, a method of printing a 3D article comprises selectively depositing a first portion of build material in a fluid state onto a substrate to form a first region of build material; selectively depositing a first portion of support material in a fluid state to form a first region of support material; and selectively depositing a second portion of build material in a fluid state to form a second region of build material, wherein the first region of support material is disposed between the first region of build material and the second region of build material in a z-direction of the article. In some cases, the first region of support material forms a grayscale pattern and/or a CMY color pattern in combination with the first region of build material and/or the second region of build material.