*2.2. Case Study Procedure*

The project begins with the reception of the original digital model that contains all the information of almost 1500 pieces modeled in 3D in step format. From them, a process of graphic re-engineering is carried out to prepare the pieces for their manufacture. First, six teams prepare the plans for the manufacture of the model. Subsequently, two teams and two supervisors create the replica through additive techniques (3D printing in polylactic acid, and photosensitive resin) and subtractive techniques (CNC laser cutting and cutting in PVC and methacrylate).

The resolution of this problem, which enables the conservation and transmission of aerospace heritage, is presented as a case study to establish graphic engineering procedures that allow the creation of HDMs based on low-cost digital manufacturing.
