###### Abstract  
In order to increase the efficiency of the Spanish health system, minor surgery programs are currently carried out in primary care centers. This organizational change has led to the need to train many general practitioners (GPs) in this discipline on a practical level. Due to the cost of the existing minor surgery training models in the market, pig's feet or chicken thighs are used to practice the removal of figured lesions and the suture of wounds. In the present work, the use of 3D printing is proposed, to manufacture models that reproduce in a realistic way the most common lesions in minor surgery practice, and that allow doctors to be trained in an adequate way. Four models with the most common dermal lesions have been designed and manufactured, and then evaluated by a panel of experts. Face validity was demonstrated with four items on a five-point Likert scale that was completed anonymously. The models have obtained the following results: aesthetic recreation, \(4.6\pm 0.5\); realism during anesthesia infiltration, \(4.8\pm 0.4\); realism during lesion removal, \(2.8\pm 0.4\); realism during surgical wound closure, \(1.2\pm 0.4\). The score in this last section could be improved if a more elastic skin-colored filament were found on the market. 3D printing; additive manufacturing; fused deposition modeling (FDM); minor surgery; primary care; surgical training Article Use of 3D Printing in Model Manufacturing for Minor Surgery Training of General Practitioners in Primary Care  
[PERSON]. [PERSON], [PERSON], [PERSON], [PERSON]. train students and residents during their training period [12; 13; 14]; (ii) to explain the interventions to patients before the operation [15; 16]; (iii) to prepare the intervention, when it is complex [17; 18]; (iv) to manufacture custom prostheses [6], among other uses. Despite the increasing use of 3D printing in hospitals [19], the authors have not found any work related to the use of 3D printing in primary care. In the present work, we propose the use of 3D printing to train general practitioners in minor surgery. In Spain, with the development of primary care, the competencies of general practitioners (GPs) have been expanded with the aim of increasing the efficiency of the health system [20]. As in other European countries, the development of one of these competencies led to the creation of minor surgery programs in health centers [21]. In them, interventions for common lesions (dermal nevus, seborrheic keratosis, or epidermal cyst) are carried out [22]. GPs should learn these skills during their resident internal doctor-training period. However, due to the shortage of skilled adjunct professionals, practical training in this field is not adequate [23]. To make up for this lack, GPs interested in developing these aspects of their professional competence have to be trained through specific courses [24]. In minor surgery courses, the different phases of an intervention are taught [25]: (i) infiltration of anesthesia at the local level, (ii) removal of the lesion, and (iii) closure of the surgical wound. There are training models on the market that allow some of these phases to be practiced; however, these models have several handicaps: they do not have all the typical lesions in minor surgery, they do not faithfully reproduce the lesions of minor surgery, and they have a high cost. For these reasons, courses traditionally use pig's feet, chicken thighs or bacon to practice the removal of figured lesions and suturing of wounds. The purpose of this project is to design, manufacture (via the FDM 3D printing technique), and evaluate models for minor surgery courses in primary care centers. For this purpose, the most common lesions in minor surgery have been selected and modeled in 3D. These models have been manufactured using a double extruder printer, equipped with flexible filament. The models thus manufactured have been evaluated by a panel of experts in minor surgery.