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Fraunhofer IGD scientists develop new process to avoid stair-step artifacts

Eliminating the artifacts in multi-material 3D printing using a purely geometric and algorithmic method

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Scientists at Fraunhofer IGD – Mostafa Morsy Abdelkader Morsy, Alan Brunton, and Philipp Urban – whose ‘3D Printing Technology’ department is responsible for the creation of Cuttlefish, have devised a purely geometric and algorithmic method for the elimination of stair-step artifacts in multi-material 3D printing. To avoid quantization errors, the surface of the object is modulated with a high-frequency signal. This results in geometrically accurate and color-true surfaces. The research team has set down their findings in a paper titled ‘Shape Dithering for 3D Printing’, which will be published to coincide with SIGGRAPH, the premier conference, and exhibition on computer graphics and interactive techniques – where the research will be presented by the lead author, Mostafa Morsy Abdelkader Morsy.

Stair-step artifacts are unavoidable in conventional 3D printing processes. They are visually unappealing and can also be structurally detrimental to the print. To generate more accurate surfaces, researchers at the Fraunhofer Institute for Computer Graphics Research IGD have developed a new process for polyjet printers –  minimizing quantization errors so that stair-step artifacts are no longer noticeable in actual printing, and are at a level far below the physical effects of the printing process. This results in objects with a smoother and more uniform surface.

Fraunhofer IGD scientists develop new process to avoid stair-step artifacts. Eliminating the artifacts in multi-material 3D printing
“Quantization artifacts are a fundamental issue for all 3D printing technologies, but especially for multi-material jetting printers. Despite their high solutions, staircasing artifacts (a) can be visually irritating, and can structurally weaken the part [Moore and Williams 2015]. Existing techniques [Kritchman2010] (b) are limited to specific surface orientation, introduce considerable extra computation, and do not remove all artifacts. Our purely geometric and algorithmic technique (c) removes staircase artifacts in all surface orientations, accounts for resolution anisotropy, and introduces a minimal computational overhead.” – Shape Dithering for 3D Printing
To achieve the desired effect, the surface of the object is modulated with a high-frequency signal, such as blue noise. This leads to a distribution of quantization errors to high frequencies, which are then later removed by the function of the human eye and multiple printing processes. “The printing time remains the same, regardless of the process. The dithering process does not require additional computing time either,” explained Alan Brunton, a member of the three-person author team.

The process is used, for example, in the entertainment industry, where figures and objects are printed for animated movies, video games, and board games. In contrast to previous processes, they benefit from the geometric and color precision conferred by the shape-dithering approach – making them look especially realistic.

The dithering process can be used as a purely algorithmic method, independently of the hardware (i.e. with different polyjet 3D printers). The solution presented in the research paper is used with the Cuttlefish 3D printer driver developed by Fraunhofer IGD. Based on the results now published – in the future, the scientists will investigate the further hypothesis of whether the smoother surface of the printed objects also makes them more resilient.

 

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Edward Wakefield

Edward is a freelance writer and additive manufacturing enthusiast looking to make AM more accessible and understandable.

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