3D printing filaments with anti-microbial superpowers have been treated to prevent the growth of bacteria which may be pathogenic or cause unpleasant odours and stains. It is worth noting that the anti-microbial ingredients used often have a shelf-life and will loose effectiveness over time. Inorganic anti-microbial ingredients will usually have a longer shelf-life than organic ones. Always check the Technical Data Sheet for information regarding this. Anti-microbial 3D printing filaments are often PLA based so will print relatively easily.