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No description available.

In recent years, multi-jet fusion technology became more popular as it has unlimited potential. Thanks to this technology, it became possible to produce products with complex geometries.This gives a massive advantage compared to the conventional manufacturing process, as by utilising 3D printers, the costs and environmental impact are reduced exponentially with regards to the fact that this is a new technology. Product quality is one of the most important factors when it comes to product manufacturing for a company to stay competitive in the market. This study was conducted in FABLAB at Halmstad University. The research focuses on different aspects of the fabricated test artefacts, such as surface roughness, tensile strength and dimensional deviation. How different printing parameters can affect the printing quality of the printed parts is then analysed. The result is then compared with designed CAD model. During this study, some experiments were conducted by printing test samples at different build orientations to define the printing quality. Measurement is conducted on the different test artefacts and quantified. The effect from build orientation on surface roughness, tensile strength and dimension accuracy were studied during this thesis. The test samples were measured by using appropriate measuring equipment that was available at Halmstad University. From the test results, it becomes clear that the build orientation directly impacts the printing quality of the printed test samples from the HP multi-jet fusion 3D printer

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When skeletal fractures are too extensive for fixation with plates and screws, autografts are the most used technique for treating this. Within the biomedical field the interest in biodegradable implants made from additive manufacturing have increased. Magnesium alloys has also gained interest because of its favorable mechanical properties.. The objective of this project is to report on new knowledge, possibilities and limitations of powder bed fusion-laser beam (PBF-LB) printed magnesium-based alloys for biomedical applications, specifically the mechanical properties of WE43. Before the practical work was carried through, a gathering of literature from scientific papers was put together to a background with information regarding Magnesium, additive manufacturing, microscopic observation methods and mechanical testing.  The practical elements were divided into 4 different categories: printing, sample preparation for observation and testing, microscopic observation, and mechanical testing. All the collected data was observed and discussed, and lastly compiled in to a result with microscopic images, stress-strain curves and data tables. It was discovered that the mechanical properties differed between the two build orientations. The specimen most appropriate for load bearing implants was the horizontal build direction. The differences between 67° and 90° scan strategy were that the 90° scan strategy with horizontal build orientation showed the lowest Young´s modulus which is favorable, whereas the 67° scan strategy showed higher tensile strength and ductility which also is favorable. Thereby no conclusion could be drawn on whether a 67° or 90° scan strategy was preferable. The conclusion was made that a horizontal build orientation had the most optimal mechanical properties, and that more research needs to be conducted on this topic before it can be used for biomedical applications.