3D printing a CAD modelnormally requires conversion into a polygon mesh, usually an STL-file, in orderto be able to load the model in the slicer. This conversion destroys roundsurfaces and replaces them with flat surfaces. Slicing a polygon mesh resultsin one or more polygons, consisting of a number of straight lines. This canaffect both dimensional accuracy and surface smoothness. Modern 3D-printerscan, in addition to straight lines, handle arcs. However, today’s commonslicers can not generate arcs as the input does not contain any curvedfeatures. This project aims at finding an alternative solution. By directslicing of CAD models the slices can contain arcs, and the slicer can producearc commands for the 3D-printer. During this project a prototype slicer isconstructed as a proof of concept. The prototype handles STEP-files as inputand creates both linear and circular movement for the 3D-printer. The resultsshow that both the intermediate files (STEP/STL) and the resulting G-code filescan get smaller, yet preserving the original shape, by using this method. Theproposed solution has a positive effect on the 3D-printing workflow as well, asthe intermediate files can be imported back into the CAD system. The projectconcludes that there is possibly a bright future for direct slicing, but thereare more problems to solve before it can become reality.

Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1982. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING / Bibliography: leaves 91-92. / by Susan Roberta Curtis. / M.S.

Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1981. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Bibliography: leaves 46-47. / by Paul Byers Trevithick. / B.S.

For this thesis, the concept of e-mass customization, supported through e-commerceand away from mass production is considered as an alternative and sustainable strategyfor fashion and textile companies of western markets. Since the need for selfactualization and individualization increases among western societies, in addition tosustainably conscious consumption patterns, mass customization is one strategicsolution to face current market trends. In accordance to that, it is aimed to find highlyflexible supply chain possibilities suitable for this volatile industry sector. This isaccompanied by exploring modern and innovative production and information andcommunication technologies to ease cost, location and risk advantages. The main effortis placed on digital textile printers since this technological integration is regarded as ahub that supports a digital, yet flexible supply chain setup, regardless of point ofproduction. / Program: Master programme in Applied Textile Management

Thesis. 1978. Elec.E.--Massachusetts Institute of Technology. Dept. of Electrical Engineering and Computer Science. / MICROFICHE COPY AVAILABLE IN ARCHIVES AND ENGINEERING. / Includes bibliographical references. / by Robert Roy Buckley, Jr. / Elec.E.

A indústria de cerâmica branca de objetos decorativos e utilitários, produz diariamente um contingente significativo de resíduo de gesso, oriundo do descarte dos moldes, cuja vida útil é extremamente curta. A deposição desse material via de regra é feita em aterros sanitários, sem qualquer tipo de isolamento em células e sem observar as recomendações da Lei da Política Nacional de Resíduos Sólidos. De acordo com a hierarquia estabelecida pela lei, a supressão da geração dos resíduos sólidos aparece como alternativa prioritária do ponto de vista das boas práticas ambientais. É nessa perspectiva que a tecnologia de produção industrial computadorizada de objetos tridimensionais por deposição de matéria prima, surge como alternativa. A intenção desse trabalho é apresentar conceitos de produtos que potencializem o uso dessa tecnologia através de configurações formais inovadoras para o setor, eliminando a utilização do gesso em seu processo de fabricação além de avaliar os resultados obtidos através da análise dos protótipos fabricados. / White ceramic industry of decorative and utilitarian objects, produces daily a significant contingent of waste gypsum, originated from the disposal of moulds, whose lifespan is extremely short. Deposition of this material usually is made in landfills without any type of isolation cells and without observing the recommendations of the Law of the Brazilian solid waste Policy. According to the ranking established by law, the elimination of solid waste generation appears as a priority alternative in terms of good environmental practices. In this perspective, the technology of computerized industrial production of three-dimensional objects by deposition of raw material, is an alternative. The aim of this paper is to present product concepts that enhance the use of this technology through innovative formal settings for the sector and make an analysis about the results.

O uso da digitalização e da impressão tridimensional (3D) com a produção de biomodelos que possam ser usados em aulas práticas das disciplinas de anatomia veterinária no Brasil é uma ferramenta inovadora. O acesso dos alunos a essa material didático pode representar um aspecto importante no aprendizado da anatomia de animais domésticos. Neste estudo, foi utilizado um scanner que faz a captura tridimensional das imagens e uma impressora 3D que realiza a impressão por deposição de material fundido (FDM) para produzir modelos esqueléticos de do membro torácico do equino. Foram usados a escápula, o úmero, radio e ulna, ossos do carpo e falanges usada para produzir modelos digitais. Estes foram então usados para produzir modelos físicos através da impressão, realizada em várias escalas. As características anatômicas dos modelos impressos tridimensionais (3D) foram então comparadas com as dos ossos do esqueleto original. Os resultados deste estudo demonstraram que os biomodelos de animais podem ser rapidamente produzidos usando a tecnologia de impressão 3D. Em termos de precisão entre os biomodelos e as peças anatômicas originais não houve diferença significativa na estatística. Todas as características, exceto o forame nutrício, puderam ser identificadas nas cópias impressas em 3D. / The use of three-dimensional (3D) scanning and printing for the production of biomodels that can be used in practical classes of veterinary anatomy disciplines in Brazil is an innovative tool. The students ease of access to this teaching material can be an important aspect of learning the anatomy of domestic animals. In this study, a scanner was used to capture three-dimensional images and a 3D printer that performs die-cast printing (FDM) was used to produce skeletal models of equines thoracic limb. The scapula, humerus, radius and ulna, carpal bones and phalanges were used to produce digital models and physical models for 3D impressions. The anatomical characteristics of the three-dimensional printed models were then compared with those of the original skeletal bones. The results of this study demonstrated that animal biomodels can be rapidly produced using 3D printing technology. In terms of precision between the biomodels and the original anatomical parts, there was no significant statistical difference. All the characteristics, except for the foramen nutritium, were successfully identified in the 3D printed copies.

This thesis deals with foldable, portable and eco-friendly textile furnishing for students. Students move quite often and therefore big and heavy furniture is sometimes a problem. In this project prototypes of a hanging sofa called Idle and a hanging storage system called Hang Around are presented. These products can be pulled up to the ceiling when there is no use for them and taken down when needed. The idiom of the products communicates stability and security even though they are suitable for living in motion. The aim has been to create sustainable products that can help to maintain the feeling of home and security in the middle of a hectic and mobile life. The forms of the products and the textile patterns have been developed simultaneously. The inspiration for the pattern design comes from Northern forests. The patterns are digital printed on woollen fabric. The materials and techniques used in this project were chosen because of their limited environmental impacts. Idle and Hang Around are designed to suit the concept house Nestet, which is an eco-friendly exhibition house with solid wood construction. The house, where Idle and Hang Around appear, was built in the centre of Borås in June 2005. / <p>Program: Konstnärligt masterprogram i mode- och textildesign</p><p>Uppsatsnivå: D</p>

Este estudo tem como hipótese: o desenho de estamparia para a roupa de cama obteve grandes avanços decorrentes da associação dos processos criativos aliados às novas tecnologias. A partir dos anos de 1990 com a implantação dos sistemas informatizados, iniciou-se uma nova fase no desenvolvimento de novos desenhos de estamparias têxteis para roupas de camas no mercado brasileiro. Por meio da evolução tecnológica, a princípio, criou-se uma nova forma de pensar e desenvolver os projetos de design e processos industriais, que levaram algum tempo e muitas horas de treinamentos para as assimilações e compreensões das novas metodologias, agora, de forma digital. Este estudo parte de uma abordagem qualitativa de caráter exploratório onde depreenderá as etapas criativas nos processos de desenvolvimento dos desenhos de estamparias têxteis digitais a partir das implantações dos computadores e seus respectivos softwares gráficos, Este levantamento ocorreu por meio de entrevistas com profissionais de indústrias de produtos têxteis para roupas de cama estampadas para a moda lar e decoração, que utilizam em seus processos de beneficiamentos têxteis, as estamparias tradicionais e as novas impressões digitais, ambas em tecidos planos, com apresentação das etapas dos processos criativos no desenvolvimento dos desenhos de estamparias têxteis na região da Grande de São Paulo. Apresenta-se um projeto de desenhos digitais têxteis de repetições (rapports), com estampas coordenadas em suas cores e traços e impressas com a técnica digital direta para produtos de roupas de cama com temas referentes à cultura brasileira. A importância dos processos digitais para as criações dos desenhos de estamparias têxteis proporcionou uma alta demanda de consumo, oferecendo maior rapidez nos aspectos de desenvolvimento com novas opções criativas e infinitas possibilidades de cores e desenhos, principalmente nos processos de impressões digitais diretas (inkjet) sobre tecidos planos com fibras de algodão / This study have as possibility: the print design for bedline scored big advances resulting of association of creative´s process allieds the news technologies. From the years of 1990 with the deployment of information systems by means of computers, began a new phase in the development of new stamps designs textiles for bedding in the Brazilian market. By means of technological change, the principle has created a new way of thinking and develops design projects and industrial processes, which took some time and many hours of training for the assimilations and understandings of the new methodologies, now digitally.This study is part of a qualitative approach of exploratory character where obvious that creative steps in the processes of development of textile digital stamps designs from computer deployments and their respective graphics software, through interviews with professionals in industries of textile products for stamped bedding for fashion and home decoration, which use in their processed textile processes the traditional stamps and new prints , both in wovens, showing the stages of the creative processes in the textile stamps designs developments in the region of greater São Paulo. Will be presented a project of digital textile designs of repetitions (rapport), with prints coordinates in their colors and strokes and printed by direct digital technique for bedding products with themes relating to the brazilian culture. The importance of digital processes to the creations of drawings of textile stamps provided a high consumer demand, offering greater speed on aspects of developments with news creatives options and endless possibilities of colors and designs, mainly in cases of digital direct prints (inkjet) on flat woven fabrics with cotton fibers

Over the last decade, two dimensional (2D) materials have attracted considerable attention from both the scientific and engineering community due to their unique properties. One important advance of 2D materials is that they can be exfoliated into nanosheets suspended in a liquid phase and that this allows the formulation of 2D nanomaterials inks. Such inks can be deposited as functional components through low-cost inkjet printing techniques. Many 2D materials based inks have been produced over the years. This thesis investigates the use of inkjet printing to deposit 2D materials such as graphene oxide (GO) and black phosphorus (BP).GO, a derivative of graphene, has been widely used to produce graphene-based conductors via inkjet printing owing to its good stability in readily available solvents such as water. In this work, highly conductive reduced graphene oxide (rGO) films with bulk conductivity in excess of 2 × 10^4 Sm-1 have been prepared by inkjet printing a GO aqueous ink, with mean flake size 35.9 micro metre, through a 60 micro metre inkjet printing nozzle followed by a reduction step. Experimental results showed that individual GO flakes up to 200 micro metre diameter can be successfully printed with no instances of nozzle blocking or poor printing performance. The mechanism by which this occurs is believed to be GO sheet folding during drop formation followed by elastic unfolding during drop impact and spreading. In addition, the influence of GO flake size on rGO film conductivity has been investigated. It was found that the rGO film conductivity increased about 60% when the mean flake size of the GO flakes in the ink increases from 0.68 micro metre to 35.9 micro metre. The drying behaviour of printed GO droplets has been studied on eight GO aqueous inks in which the mean flake size of GO was varied over a range from 0.68 to 35.9 micro metre. It was found that the coffee ring effect (inhomogeneous drying of a droplet to leave a ring like deposit) of dried droplets of the GO ink weakened and disappeared when the flake size increasing. It was found that, with a printed deposit around 340 micro metre in diameter, the coffee ring effect (CRE) was suppressed with the mean flake size > 10.3 micro metre. The critical flake size for CRE suppression reduced to 5.97 and 3.68 micro metre when the substrate temperature was 40 and 50 °C, respectively. It was further found that the CRE weakened with decreasing printed drop size, with the critical flake size reducing to 1.58 micro metre with a printed drop diameter of 30 micro metre.The interaction between BP nanometre thickness flakes and humid atmospheres was investigated using an inkjet printed BP sensor. The BP sensor showed was very sensitive to changes in humidity with a response time of a few seconds and the effect is reproducible in minutes. However, long term exposure to humid air with a relative humidity (RH) > 11% leads to a significant chemical change in the BP films, with Fourier transform infra-red spectroscopy (FTIR) indicating partial hydrolysis of the BP to form phosphate and phosphonate ions. Low temperature heat treatment of BP films under dry conditions after exposure to elevated RH leads to a partial recovery of the impedance response and reversion to a chemical state similar to that before exposure to a humid environment. The recovery of BP properties is most complete after exposure to lower humidity environments (RH < 11%), although exact replication of the original impedance response and FTIR spectrum was not possible.