• 한국CDE학회논문집
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• 제22권1호
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• pp.10-17
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• 2017

The recent 3D printing industry has been focusing on developing 3D printers to fulfill the user's need to bring more colorful and realistic outcomes. Several 3D printers have deployed multiple extruders to print different colors. However, this method has a limit on its availability of colors. To solve this, recent research is focused on using mixing chambers to mix the possible colors to provide more color availability. In this paper, we discuss the environment and algorithm behind the development of G-code which allows a gradation effect of the mix of two filaments. The generation algorithm to make gradient G-code has been implemented in Cura using C ++ and Python.

• 한국산업융합학회 논문집
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• 제26권5호
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• pp.937-943
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• 2023

In this study, the mast cover of submarine was reverse engineered and structural analysis was performed. In order to print with the 3D printer, the modeling was reduced to 1/5 size by applying geometric similarity. From the structural analysis results, it was found that the maximum value of equivalent stress generated in the mast cover was 180.9 MPa. This stress value occurs on the inner surface in the major axis. As a result of applying the load condition at a diving depth of 600 m, the mast cover is in a completely elastic state. The 1/5 size model printed on FDM 3D printer with PLA filament was the same as the reverse engineered modeling and it was printed in a perfect shape with no apparent defects. The 1/5 size model printed on PBF 3D printer with SUS316L powder was perfectly manufactured with no apparent defects.

• 한국의류산업학회지
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• 제19권3호
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• pp.312-319
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• 2017

The purpose of this study was to develop a customized wrist brace using 3D scanner and 3D printer. This study included in-depth interviews with people who had wrist pain and ever used wrist braces. The wrist brace has been designed and modeled by the CAD program after 3D scanning the wrist of subjects. Based on the results of the in-depth interviews on wrist brace users and design investigation in the market, a prototype of the wrist brace has been created. The wrist brace does not compress the hand and is easy to put on. In addition, it is adjustable to the wrist of users, allowing them to move his or her wrist without any restrictions. A computer-modeling program produced solid files for the design of the wrist brace after 3D scanning ten subjects' hands. It features a lattice-patterned surface, a velcro adjustment and trimming to smoothen the surface. PLA filaments were used to 3D print the wrist brace. As for the assessment, the wrist brace has been evaluated to be easy to put on and adjust to user's wrist. However, when it comes to appearance and comfortability, it was rated 3.0 or slightly above. This is because 3D printing materials are firm and not flexible compared to other materials such as neoprene or stretchable bands.

• 한국방사선학회논문지
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• 제13권7호
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• pp.947-953
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• 2019

임상에서 사용하는 진단 검사 장치인 전산화 단층촬영기와 자동화된 설계 소프트웨어(MediACE 3D Prog ram), 3D 프린터로 손목 보조기를 제작하고자 하였다. 전산화단층촬영기로 상지의 Dicom 파일을 획득한 후 MediACE 3D Program을 통해 손목 보조기를 디자인하여 "STL(stereolithography)"파일을 만들었고, 디자인된 손목 보조기는 3D 프린터를 이용하여 인쇄하였다. 3D 프린팅 기술로 제작된 손목보조기의 효용성 검증을 위해 뼈와 피부에 가해지는 압력 및 보조기의 스트레스 분포를 유한요소해석으로 나타내었다. 손목 보조기를 제작할 때 유한요소해석의 결과를 가지고 뼈와 피부가 압력에 의한 손상과 보조기의 파손이 자주 일어나는 부위를 보강하여 손목 보조기를 제작할 수 있을 것이라고 기대된다.

• 문화기술의 융합
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• 제4권1호
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• pp.27-32
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• 2018

최근 AR 기반 스토리텔링을 위한 체험학습 콘텐츠가 많이 개발되고 있는 추세이다. 본 논문에서는 3D프린터를 활용하여 체험학습의 흥미와 재미를 더할 수 있는 스토리기반의 성장형 콘텐츠를 개발하고자 한다. 3D프린터를 활용하여 출력한 캐릭터는 개인 기념품으로 소장함으로써 그 가치를 상승시킬 수 있고, 성장형 콘텐츠를 통해 지역문화와 역사 그리고 관광 생태 체험을 함으로써 이해와 재미를 증진시킬 수 있어 교육 효과를 향상시킬 수 있다. 본 연구의 목적은 체험학습 할 지역의 문화와 생태에 대해 오브젝트 스마트 디바이스에서 가상으로 생성시켜 성장과정을 거친 후 3D 프린터를 활용하여 결과물을 개인 기념품으로 출력함으로써 교육 효과를 높일 수 있는 체험 학습용 콘텐츠 애플리케이션을 개발하는 것이다. 개발된 체험 학습용 콘텐츠 어플리케이션은 학생 및 관광객을 대상으로 관광 정보 제공 및 학습용 콘텐츠로 활용 할 수 있으며, 3D프린팅 기술을 통해 다양한 콘텐츠 개발을 하기 위한 새로운 원동력이 될 수 있다.

• 한국전자통신학회논문지
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• 제16권5호
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• pp.909-916
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• 2021

3D 프린터는 개인의 창의력을 실제로 구현할 수 있는 장점이 있다. 이 특성을 활용하려는 사람들은 증가하고 있지만 적합한 프린팅 교육의 기회 부족과 잘못된 출력 방법으로 문제 발생의 어려움을 겪는다. 따라서 저하된 출력물 품질이 사용자의 관심을 낮춰 점차 3D 프린터의 활용빈도 수를 감소시키게 된다. 본 연구에서는 3D 프린터의 오작동 해결과 편의성의 개선을 위해 직접 기기를 작동하면서 발생하는 문제를 파악하고 분석했다. 여러 문제점 중 안착 불량, 스트링 현상, 노즐 막힘을 중점으로 해결과 완화 연구를 진행하였다. 또한, 3D 프린터의 기능을 실험을 통해 재료소모량 감소와 출력시간 단축 방법을 고찰했다. 최종적으로 3D 프린팅 중 빈번하게 발생하는 출력문제를 해결해 외관이 온전한 출력물을 얻을 수 있었고 편의성을 개선하였다.

• 한국기계가공학회지
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• 제17권6호
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• pp.53-60
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• 2018

In this paper, the effect of different 3D printing parameters including laminated angle and annealing temperature is observed their effect on FDM conductive 3D printing. In FDM 3D printing, a conductive filament is heated quickly, extruded, and then cooled rapidly. FDM 3D Print conductive filament is a poor heat conductor, it heats and cools unevenly causing the rapid heating and cooling to create internal stress. when the printed conductive specimens this internal stress can be increase electrical resistance and decrease electrical conductivity. Therefore, This experiment would like to use annealing to remove internal stress and increase electrical conductivity. The result of experiment when 3D printing conductive specimen be oven cooling of annealing temperature $120^{\circ}C$ electrical resistance appeared decrease than before annealing. So We have found that 3D printing annealing removes internal stresses and increases the electrical conductivity of printed specimens. These results are very useful for making conductive 3D printing electronic circuit, sensor ect...with electrical conductance suitable for the application.

• 한국의류산업학회지
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• 제24권5호
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• pp.505-518
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• 2022

3D printing technology, also known as additive manufacturing(AM), has not been actively used in the clothing industry despite its potential for economic, environmental, and labor efficiency. Therefore, this study aims to propose a new 3D printing method for the clothing industry, which will be more readily accessible. This roll-type printing method can print wide-sized patterns at once using a 3D modeling program and a FDM 3D printer and help overcome the limitations imposed by the size of the printer. Then, to demonstrate the practical application cases of this printing method, bags of three designs were developed. Prior to product development, a thickness test was performed for stable printing using TPU(Thermoplastic Poly Urethane) filament, and a thickness of 0.45 mm was found to be most suitable for it. Next, the time efficiency test showed that the roll-type printing method takes less time compared to the general printing method in printing wide-sized patterns. Based on these tests, three bags, , and , were developed to confirm the suitability of the roll-type printing method for product development. The advantages of 3D roll-type printing can lie in overcoming of the spatial limitation, and the environmental sustainability as it can reduce waste from the production process. This study is significant in that it presents a new 3D printing method to improve the space limitations and time inefficiency of 3D printers.

• 한국인쇄학회지
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• 제29권1호
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• pp.75-83
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• 2011

As screen printing is changed by automation recently, could print more exactly. However, must suffer great many trial and error to have still gotten perfect result. By the way, at this step, fair time and money should be invested. Therefore, if search for optimum condition in early time visualizing screen printing process using simulator program before progress printing, is judged that may be correct and gets printing result efficiently. In this paper, searched optimum printing speed and ink viscosity using FLOW-3D program. Also, the result could confirm truth that is agreeing almost with experiment contents. Through this, is thought that may expect extension of screen printing wide application that vivify advantage of screen print if use simulation program.

• 대한방사선기술학회지:방사선기술과학
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• 제39권2호
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• pp.257-262
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• 2016

본 연구는 3차원 프린터를 이용한 보청기 이어 쉘 제작기법에서 보청기 이어 쉘 제작에 필요한 모델링 구조를 DICOM(Digital Imaging and Communication in Medicine) 영상에 의한 새로운 방법으로 제시하고자 하였다. 실험방법은 DICOM 볼륨 영상에서 임계치 값을 이용한 3차원 외이도를 추출하여 3차원 프린터가 인식할 수 있는 표준 형식의 STL(STereoLithography) 파일로 모델링 표면구조를 비교하였다. 이러한 3차원 모델링은 기존의 귓본 제작 후 3차원 스캐너에 의한 인접한 등치선 사이를 3차원 표면조각들로 채워 모델링 구조를 표현한 방법들로서 본 연구에서도 DICOM 영상에 의한 삼각형 표면구조를 동일하게 만들 수 있었다. 이는 DICOM 영상에 의한 모델링 표면구조가 기존 3차원 프린터가 인식할 수 있는 동일한 환경을 제공해 최종적으로 보청기 이어 쉘 형상을 출력 할 수 있음을 나타냈다.