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In an increasing number of aggressive enterprise world, "time to market" concerning products has come to be a solution element because of enterprise success. There are exceptional techniques so expect layout mistakes or open products concerning the need between much less time. Among the most used methodologies in the design and setting about stability the requirements, Quality Function Deployment (QFD) and Design for Six Sigma (DFSS) execute remain used. In the prototyping phase, such is feasible in imitation of tackle the rising science regarding additive manufacturing. Today, three-dimensional stamping is in the meanwhile used as a rapid prototyping technique. However, the actual challenge that enterprise is going through is the use of these machineries for large-scale production about parts, at last viable along current HP Multi fusion. The aim of this article is to study the interactive design and engineering applied to the entire product development process taking advantage of the most modern models and technologies for the final realization of a case study that involves the design and prototyping of an innovative multifunctional fan (Lamp, Aroma Diffuser and fan) through the Multi Jet Fusion of HP. To begin with, issues related to the DFSS, the QFD and their application to identify the fan requirements are explored. Once the requirements have been defined, the modern CAD design systems and the CAE systems for the validation of the case study will be analyzed and applied. Finally, HP's Multi Jet Fusion methodology and design rules for additive manufacturing will be analyzed in detail, trying to exploit all the positive aspects it offers.

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The present work aims to propose a new approach for defining interactive user manual in complex assemblies, using a new enabling technology of Industry 4.0, i.e. Augmented Reality. The AR environment supports the user in stepby-step assembly on-the-fly. The study of this method, suitable to realize the assembly of parts, is a stimulating engineering mission, which can take advantage from the latest innovations in imagining technologies and computer graphics. In the present paper, a proposal for an innovative method based on Augmented Reality useful to support the components' assembly is suggested. The methodology illustrated is based upon a four steps process: at the beginning, the designer performs the assembly structure through a CAD system. In a second time, an unexperienced user assembles the same parts without any suggestion: the differences between two assembly sequences are documented and broken down in order to distinguish critical points in the assembly. Finally, a virtual user manual is shaped in Augmented Reality environment. The assembly is then performed by the same unexperienced user, guided by the AR tool. When the end user practices the instrument, the location of the item to assemble is perceived by tracking the finger position of the user itself. In order to help the end-user in the assembly procedure, a series of symbols and texts is added to the external scene. In this paper a case study based on the assembly of a scale model has been developed to evaluate the methodology. After an evaluation process, the procedure seems to be feasible and presents some advantages over the state-of-the-art methodologies proposed by literature.

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