3D Resins: There are several materials available on the market for use in 3D printers. In general, the question comes down to using ABS vs PLA. These are the two most common materials used in 3D Printers. ABS as a polymer can take many forms and can be engineered to have many properties. In general, it is a strong plastic with mild flexibility (compared to PLA). Natural ABS before colorants have been added is a soft milky beige. The flexibility of ABS makes creating interlocking pieces or pin connected pieces easier to work with. It is easily sanded and machined. Notably, ABS is soluble in acetone allowing one to weld parts together with a drop or two, or smooth and create a high gloss finish by brushing or dipping full pieces in acetone. Compared to PLA, it is much easier to recycle ABS. Its strength, flexibility, and higher temperature resistance often make it a preferred plastic by engineers and 3Ders alike.