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Given the maturity reached by the Fused Deposition Modeling manufacturing technology the parts should be capable of supporting operating load comparable with parts manufactured using conventional manufacturing methods. The complete manufacturing process is discussed starting form scanning, geometry processing, 3D printing preliminaries and manufacturing process by Fused Deposition Modeling. The final part - engine fan - will be investigated under dynamic load for rapid prototyping and injection molding manufacturing solutions. A numerical model will be used to complete the experimental data.