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Design of PET bottle recyclation device for creation of 3D printing filament
Huplík, Ondřej ; Kolomý, Štěpán (referee) ; Sedlák, Josef (advisor)
The rise in popularity of 3D printing and the increasing amount of plastic waste are putting an emphasis on finding new sustainable and environmentally friendly solutions. This thesis addresses the issue of recycling plastic materials and how PET plastic can be used in 3D printing. The theoretical part describes the current possibilities of plastic recycling. The practical part focuses on the design of a device that accepts a PET bottle strip and converts it into filament by bringing it above the glass transition temperature. The device is designed with cost and compactness in mind. The device can be further improved and adapted for different types of plastic materials.
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Optimization of infill selection with an emphasis on maximum dynamic resistance
Konvalina, Michal ; Svoboda, Petr (referee) ; Jopek, Miroslav (advisor)
The thesis deals with the study of the effect of different wall thicknesses of 3D printed infill patterns at constant cross-sectional area on their final properties under static and dynamic loading. Based on literature study, two experimental methods are chosen. The quasi-static test and the Taylor anvil test. For the experiment, square and hexagonal grid specimens are printed using FDM technology from PLA material. Quasi-static test is used to measure the static properties such as maximum compressive strength, yield stress, modulus of elasticity and to derive material model of Johnson-Cook. The dynamic impact test TAT is used to evaluate different types of patterns at high impact velocities. In ANSYS, the specimens that resisted the highest impact velocities in TAT are simulated and strain rate sensitivity parameter is optimized for the specific velocity. The highest dynamic resistance was achieved by a square infill pattern with wall thickness of 0,4 mm at an impact velocity of 37 ms-1.
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Construction of a small portable 3D printer
Netušil, Jan ; Vyroubal, Petr (referee) ; Bayer, Robert (advisor)
The study is dedicated to the description of 3D FDM printing technology, compares different types of 3D FDM printers and analyzes key components, especially those necessary for a stable portable 3D printer design. It also includes the specific design of the portable 3D FDM printer solution, its assembly, the actual enhancement of the design, and the design and implementation of the braking arresting elements. It also addresses the printing testing of advanced construction materials suitable for 3D FDM printing and provides a cost estimation and evaluation of the cost-effectiveness of building a portable 3D FDM printer.
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Design and construction of multipurpose FDM 3D printer
Kyselica, Martin ; Bayer, Robert (referee) ; Jaššo, Kamil (advisor)
This thesis is aimed on a theoretical analysis of the issue of various 3D printing technologies with a deeper focus on FDM technology. The principles of the function, areas of use, their advantages and limitations are presented. Individual types of FDM 3D printers are compared. An analysis of the main components of the structure, movement mechanism and electronic components of common rectilinear Cartesian FDM 3D printers is created. A 3D model of a custom solution for the construction of a 3D printer of the CoreXY type is proposed. The printer is constructed and configured. Calibration and testing have been carried out.
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The effect of bio-pigments on the properties of PLA materials for 3D printing
Vacula, Jan ; Figalla, Silvestr (referee) ; Menčík, Přemysl (advisor)
This thesis deals with the influence of naturally derived dyes on the properties of polylactic acid (PLA) for 3D printing using the FDM method. In the production of 3D printing filaments, it was crucial to understand the behavior of bio-dyes within the material. Thermogravimetric analysis (TGA) was performed to determine the thermal stability of the bio-dyes. Based on the resulting thermal stabilities, seven bio-dyes were selected from which concentration series were prepared in the form of 3D printing filaments. The influence of adding bio-dyes to the PLA polymer matrix was defined using gel permeation chromatography (GPC). To assess the impact of bio-dyes on the mechanical properties of the materials, tensile testing and three-point bending tests were chosen. It was found that adding bio-dyes does not significantly reduce mechanical properties. Furthermore, UV stability was investigated through accelerated exposure in a chamber with a xenon lamp. The influence of UV radiation on individual bio-dyes was defined through colorimetric evaluation. The results were key for further development and optimization of the use of natural dyes in the manufacturing process of 3D printing filaments.
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Biodegradation of 3D printed composites based on poly(3-hydroxybutyrate)
Gazdová, Nikol ; Menčík, Přemysl (referee) ; Melčová, Veronika (advisor)
This bachelor thesis deals with the biodegradation of 3D printed bodies composed of poly(3- hyroxybutyrate), polylactic acid, bioceramics and plasticizer. These components were selected for their biocompatibility and properties that could be used in tissue engineering as a temporary, absorbable bone tissue replacement. The main objective was to investigate the effect of the individual constituent bodies on the biodegradation itself. Biodegradation was carried out at 37 °C in a solution simulating the ionic concentration of blood plasma. Samples were sequentially withdrawn at monthly intervals for five months. To evaluate the results, 2 methods were used, weight change and compression test, where the strength of each body was evaluated. From the evaluation of the data it was not possible to reach a uniform result on which substance influences biodegradation the most, because it always depended on the ratio of the other substances. To investigate the effect of poly(3-hydroxybutyrate) and polylactic acid on the rate of biodegradation, mixtures of RP9, RP10 and RP15 were compared. It showed that a higher polylactic acid and lower poly(3-hydroxybutyrate) content had a significant positive effect on the biodegradation rate, as the difference between the weight loss for the RP9 blend with the highest poly(3-hydroxybutyrate) content and the RP10 blend with the highest polylactic acid content was 8.37% for solid bodies and 4.13% for porous bodies. For strength, the difference was 73.32% and 73.65% for the solid and porous bodies, respectively. Observing the effect of bioceramic content on the RP11, RP12 and RP15 mixtures, we concluded that this effect was almost negligible on the biodegradation rate The difference in weight loss between the RP11 mixture with the lowest bioceramic content and the RP12 mixture with the highest bioceramic content was only 1, 68 % for solid bodies and 0.99 % for porous bodies, while mixture RP15 showed the highest biodegradation rate despite having a medium value of bioceramics in the mixture. For the mechanical properties, this then amounts to a difference of 10.4% for the solids and 7.57% for the porous bodies. When comparing the effect of plasticizer for mixes RP13, RP14 and RP15, the effect was more on the strength drop, where the difference in strength drop for mix RP13 with the lowest plasticizer content and RP14 with the highest plasticizer content was different by 20.3% and 18.16% for the solid and porous body, respectively. The decrease in weight was then different by 4.1 % and 0.83 % for the solid and porous body, respectively. Finally, bioceramics from different companies emerged as an important element for the biodegradation rate. Hydroxyapatite from Applichem was the best biodegraded and hydroxyapatite from CN Lab was the worst. The difference for weight loss was 17.35% for the solid and 5.93% for the porous body. The strength loss was then different by 55.6% for the solid body and 33.38% for the porous body.
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Design and production of experimental axle part
Volfík, Jiří ; Slaný, Martin (referee) ; Zemčík, Oskar (advisor)
The content of this diploma thesis is a design of construction and selection of suitable material for upper-carrier part used for racing vehicle, produced by FDM 3D printing with the alternative option to replace an existing part, which was produced by conventional technique of CNC machining. Various versions of the experimental part are analyzed by FEM and compared in terms of safety coefficient with target to select the most appropriate construction design. The chosen version of the model is at the end compared with already existing part, which was also analyzed by FEM.
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