Background: The 3-D printer industry is projected to grow to $16.2B by 2018. These instruments can be used as manufacturing tools, anywhere from printing consumer products, e.g. toys, to medical tools, e.g. implants, prosthetics, surgical tools. As 3-D printers are becoming more readily available to the average consumers, finding techniques to ensure safety is of vital importance. Brief Description: UCR researchers have developed a method of treating 3D printed objects with ultraviolet light to reduce their toxicity. They used zebrafish to assess bioaccumulation of toxic chemicals. By UV curing STL- and FDM-printed parts, they were also able to improve chemical and biological compatibility, shown by increased survival rates of zebrafish. This method is more effective than existing techniques of treating parts with supercritical carbon dioxide which requires a specialized, expensive instrument. Although the materials used are known to be toxic per stated on material safety data sheets, techniques such as this could limit the toxicity and open up more application areas for these materials and 3D printed parts.