A technique for the virtual design of a three-piece stackable auricular mold for unilateral auricular defect rehabilitation using an open-source software program is described. An optical intraoral scanner is used to scan the patient’s ear on both the affected and unaffected side. To maintain the relationship between the mold parts, a stackable attachment is designed and joined to the mold. The mold is 3D printed in resin. This technique provides the patient with a precise auricular prosthesis with perfect thickness, adaptation, and appearance. The workflow introduced in this technique could be considered as an alternative way to fabricate auricular prostheses in a much shorter clinical and laboratory time compared to the conventional workflow. Int J Prosthodont 2023;36:637–641.