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The suitability of each type of foundation-support (monopile, gravity-based and jacket) will be analyzed for the different conditions that can be found in locations with a draft of 30-50 m. Some of the most important considerations such as metocean loads, geotechnics, economic aspects, manufacturing, transportation, installation, operation and decommissioning, local content, etc. will be taken into account. Then, it continues with the establishment of a methodology for the decision making of the most suitable offshore wind turbine foundation. TOPSIS (Technique for Order Preference by Similarity to Ideal Solution), a widely used multi-criteria decision-making method that allows for both quantitative and qualitative criteria to be considered in the decision-making process, will be employed. It has been verified in this document that the proposed methodology allows the decision of offshore wind turbine foundation according to the conditioning factors, enabling not only technical and financial feasibility of the offshore wind farm to be achieved, but also respect for the environmental impacts.

Offshore wind turbine support structures --- Monopiles --- Gravity-based --- Jackets --- Multi-criteria decision making --- TOPSIS Method --- Optimal solution for offshore wind turbine foundations --- Ingénierie, informatique & technologie > Ingénierie mécanique

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Additive Manufacturing (AM), more popularly known as 3D printing, is transforming the industry. AM of metal components with virtually no geometric limitations has enabled new product design options and opportunities, increased product performance, shorter cycle time in part production, total cost reduction, shortened lead time, improved material efficiency, more sustainable products and processes, full circularity in the economy, and new revenue streams. This Special Issue of Metals gives an up-to-date account of the state of the art in AM.

Technology: general issues --- additive manufacturing --- support structures --- electron beam melting --- support structure removability --- biological origin hydroxyapatite --- bioactive layers --- cranial mesh implants --- selective laser melting --- 3D printing --- radio-frequency magnetron sputtering --- powder bed fusion --- single crystal --- grain selection --- cavity resonators --- filters --- microwave --- plating --- stereolithography --- thermal expansion --- three-dimensional printing --- directed energy deposition --- EN AW-7075 --- porosity --- ultimate tensile strength --- wire arc additive manufacturing --- WAAM --- microstructure --- magnesium --- mechanical properties --- scanning electron microscopy --- electron backscattered diffraction method --- direct energy deposition --- cold metal transfer --- 5356-aluminum --- temperature distribution --- metal powder bed fusion --- Ti–6Al–4V --- residual stresses --- heat treatments --- electron beam melting (EBM) --- process window --- stainless steel --- 316LN --- powder methods --- additive manufacturing (AM) --- post-processing --- 316L stainless-steel --- electron microscopy --- rapid tooling --- laser-based powder bed fusion (L-PBF) --- production tools --- cold working --- hot working --- injection molding --- n/a --- Ti-6Al-4V

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Additive Manufacturing (AM), more popularly known as 3D printing, is transforming the industry. AM of metal components with virtually no geometric limitations has enabled new product design options and opportunities, increased product performance, shorter cycle time in part production, total cost reduction, shortened lead time, improved material efficiency, more sustainable products and processes, full circularity in the economy, and new revenue streams. This Special Issue of Metals gives an up-to-date account of the state of the art in AM.

Technology: general issues --- additive manufacturing --- support structures --- electron beam melting --- support structure removability --- biological origin hydroxyapatite --- bioactive layers --- cranial mesh implants --- selective laser melting --- 3D printing --- radio-frequency magnetron sputtering --- powder bed fusion --- single crystal --- grain selection --- cavity resonators --- filters --- microwave --- plating --- stereolithography --- thermal expansion --- three-dimensional printing --- directed energy deposition --- EN AW-7075 --- porosity --- ultimate tensile strength --- wire arc additive manufacturing --- WAAM --- microstructure --- magnesium --- mechanical properties --- scanning electron microscopy --- electron backscattered diffraction method --- direct energy deposition --- cold metal transfer --- 5356-aluminum --- temperature distribution --- metal powder bed fusion --- Ti-6Al-4V --- residual stresses --- heat treatments --- electron beam melting (EBM) --- process window --- stainless steel --- 316LN --- powder methods --- additive manufacturing (AM) --- post-processing --- 316L stainless-steel --- electron microscopy --- rapid tooling --- laser-based powder bed fusion (L-PBF) --- production tools --- cold working --- hot working --- injection molding --- additive manufacturing --- support structures --- electron beam melting --- support structure removability --- biological origin hydroxyapatite --- bioactive layers --- cranial mesh implants --- selective laser melting --- 3D printing --- radio-frequency magnetron sputtering --- powder bed fusion --- single crystal --- grain selection --- cavity resonators --- filters --- microwave --- plating --- stereolithography --- thermal expansion --- three-dimensional printing --- directed energy deposition --- EN AW-7075 --- porosity --- ultimate tensile strength --- wire arc additive manufacturing --- WAAM --- microstructure --- magnesium --- mechanical properties --- scanning electron microscopy --- electron backscattered diffraction method --- direct energy deposition --- cold metal transfer --- 5356-aluminum --- temperature distribution --- metal powder bed fusion --- Ti-6Al-4V --- residual stresses --- heat treatments --- electron beam melting (EBM) --- process window --- stainless steel --- 316LN --- powder methods --- additive manufacturing (AM) --- post-processing --- 316L stainless-steel --- electron microscopy --- rapid tooling --- laser-based powder bed fusion (L-PBF) --- production tools --- cold working --- hot working --- injection molding