FIT Additive Manufacturing Group has developed an alternative to conventional masks in the form of the FiT filter carrier so that anyone can reduce the risk of infecting others even without a mask. The easy-to-assemble kit is reusable, disinfectable, dishwasher-safe and consists of two identical plastic baskets between which any filter material, from a paper handkerchief, cotton tissues or antimicrobial covers to professional non-woven material, can be inserted. The filter material can be replaced quickly and easily at any time, as any material loses its effectiveness due to increased moisture. Depending on which filter is inserted, the effectiveness of filtering the smallest particles out of the air also changes, as a study by the University of Cambridge has shown. In this study from 2013, the vacuum cleaner bag performed best in comparison to the surgical mask.