3D printing has been recognized as a productive and feasible innovation within the fields of progressed fabricating. In the past few years, a considerable research conducted to advance 3D printing for a better performance in manufacturing. However, the benefits of 3D printing from environmental perspective are still to be evaluated. In this paper in order to better evaluate the sustainability of 3D printing processes quantitatively and better guide the decision-makers, proposed a framework for 3D printing processes sustainability assessment as a novel system for decision making. In addition, for sustainability assessment Computer Aided Design (CAD) and Life Cycle Assessment (LCA) were utilized. A multiple mailboxes design is used as a case study for this to provide a comprehensive understanding of 3D printing for the public and provide a better guide for the future research. The results have shown that material waste can be significant reduced and also the supporting material based on product redesign.

In today’s world the design of multiple mailboxes comes to cover the evolution of logistics in delivering mail where the postman is not required to visit every user. In this research the 3D visualization is used for the design of multiple mailboxes for domestic use. It concerns the design of mailboxes in ergonomic building blocks and apartment complexes in 3D design so that they can be easily manufactured. Between the advantages of this design will be rapid production of ready-made products production of prototypes that enables testing at the design stage and reduces the time and the cost of production. The design when done with 3D CAD can be manufactured with modern machine tooling methods. In this paper after an extensive Literature Review the postal multiple mailboxes is used as a case study in the use of 3D CAD for 3D printing. A methodology is proposed that enables the examination of prototypes at the design stage according to specifications and allows the manufacturing department of a company to prepare the right tools and begin installing production lines. Conclusively this method gives the advantage of designing the product and supporting the production of scaffolds that can be functionally and ergonomically tested before finalizing the production.