3D printing, or additive manufacturing, is becoming increasingly important in the biomedical field due to the possibility of developing affordable custom devices with high flexibility in terms of materials, personalization, complexity and high precision. However, surface treatments and modifications are often needed to enable the required bio-functionality characteristics, such as biocompatibility, wettability or bioactivity. The aim of this work is to develop air filters 3D printed by Digital Light Processing (DLP) with antibacterial properties. DLP is based on the photopolymerization of liquid polymer resins and allows a rapid printing of objects with high resolution. In this thesis work, two strategies were followed: on the one hand, the design and fabrication of complex geometries which can reduce the microorganisms’ flow; on the other hand, a study of surface functionalization to obtain the desired final properties.