A new rapid prototyping machine additively builds parts that appear as if they have been injection molded and let users verify designs for form, fit, and function. The ZBuilder Ultra (available in July) from Z-Corp., Burlington, Mass., creates components using a high-resolution digital light processor (DLP) projector to solidify liquid photopolymer. According to the developer, the machine builds functional plastic prototypes two times faster than other RP technologies and at one-third of the price of stereolithography machines. The machine builds parts to tolerances of +/- 0.008 in. with feature sizes down to 0.005 in. and a smooth surface finish. The photopolymer’s material properties are similar to those of ABS.