## 1 Introduction  
This research develops a methodology to facilitate the dissemination, conservation, and universal accessibility of our architectural heritage through physical prototyping from digital twins. In this research, we have two clearly differentiated stages: the first, which we could define as \"from the physical to the virtual\", that is, the capture or digitization of reality through new technologies, and the second stage: from the digital to the physical, that is, the physical prototyping from the data obtained or, in other words, the printing using 3D technologies of the captured data (see Figure 1). * This article establishes the following three objectives: Assess and standardize a workflow that allows us to arrive from a high-resolution <<digital twins>> (output formats: obj, 3 ds, stl, etc.) obtained through photogrammetry [1,2] or TLS [3] to a physical model printed using current technologies [4,5]. * Obtain replicable models of our heritage that serve to bring our monuments closer to the greatest possible number of people through \"maker\" technologies. * Promote the \"capture\" of these \"digital models/digital twins\" and their free distribution as good practices to guarantee the conservation and dissemination of heritage. * Try to promote a philosophy of free distribution that brings our heritage closer to as many people as possible through these physical prototypes and their exchange files. As a three-dimensional working model to test this methodology, we used the digital twin made for the <<restoration project for the wall of Caceres Phase II. Almohad towers of the southwestern wall in Caceres>>. This project has been carried out by the architects Isabel Bestue Cardiel (team director), Carmen Canones Gallardo, Rosario Carmona Campos, Pablo Alejandro Cruz Franco, Adela Rueda Marquez de la Plata, and Javier Chavez Quesada. (See Figure 2). This restoration project, of which the authors of this document have been a part, has been developed on the Almohad walls of the world heritage city of Caceres [6; 7]. The work area is divided into two sections. The first section, known as the Adarve del Padre Rosalio section, is made up of a section of wall parallel to the Adarve del Padre Rosalio street, an albarrana tower, and a defensive cube. This section has a floor area of 170.79 m\({}^{2}\). The second section of the wall has an intrasdos with an extension of 16.62 linear metres. The section is on urban land and public space, and has a total floor area of 155 m\({}^{2}\). Through the extrados of this section, a double section of wall can be identified, interrupted by a flanking tower to the southeast. Beneath this stretch of wall, a possible anterumal rises from Calle Cornudilla. At the corner of Calle Adarve del Padre Rosalio there is an albarrano wall and an octagonal albarrana tower. The capture of this digital twin, as we have said, has been carried out using photogrammetry. Work has been carried out by combining point clouds obtained by SfM (with images acquired from UAV, Unnamed Aerial Vehicle) [8; 9]. To verify the reliability of the model, the models have been contrasted with the point clouds obtained by means of a digital instrument, a Terrestrial Laser Scanner, TLS [1; 10; 11; 12], and the result is a three-dimensional model. This is a high quality canvas model [6] of the city, and we can affirm that it has been obtained through a low-cost and precise \"intelligent work\" flow, having been developed essentially through photogrammetry and verifying the reliability of the model through TLS. All of this digital twin has been processed in cabinet work [13]. When we work with three-dimensional models made up of point clouds and triangulated models, a key point is to validate the geometric quality of our models. As we have said, the model obtained through SfM guarantees a very complete model, thanks to its ability to reach almost all points, especially if we compare it with a model obtained through TLS.