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The potentiality of the Fused Deposition Modeling (FDM) process for multi-material printing has been not yet thoroughly explored in the literature. That is a limitation considering the wide di↵usion of dual extruders printers and the possibility of increasing the number of these extruders. An exploratory study, based on tensile tests and performed on double-material butt-joined bars, was thus conceived; the aim was to explore how the adhesion strength between 3 pairs of filaments (TPU-PLA, PLA-CPE, CPE-TPU) is influenced by the material printing order, the type of slicing pattern used for the layers at the interface, and the infill density of the layers below the interface. Results confirm the e↵ectiveness of mechanical interlocking strategies in increasing the adhesion strength even when thermodynamic and di↵usion mechanisms of adhesion are not robust enough. Besides, thermal aspects also demonstrated to play a relevant role in influencing the performance of the interface.

The paper presents a reference framework for applications based on the mixed prototyping practice and mixed reality techniques and technologies. This practice can be effectively used for rapid design assessment of new products. In particular, the paper addresses applications regarding the use of mixed prototyping practice for the design review of information appliances. Various methods and technologies can be used according to the product aspects to validate and test. The paper describes mixed prototyping applications for positioning information appliances within systems and for the evaluation of ergonomics aspects of interactive devices