A novel self-assessment technique of 3D printer accuracy

Abstract. As Additive Manufacturing Technologies continue to evolve, the need for accuracy in 3D printing methods increases. To evaluate the accuracy of 3D printers and/or the 3D printing process, several benchmark layouts have been proposed in the literature. However, these layouts are typically very complex and do not allow the average 3D printer user to quickly reach a clear conclusion about printer accuracy. This study introduces a novel self-assessment technique for evaluating the accuracy of 3D printers. The proposed benchmark layout consists of only three main 3D-printed components. By leveraging geometric relationships and amplifying deviations through inclined surfaces, this method enables the measurement of the cylindricity of a 3D-printed cylinder without the need for specialized equipment. The layout can be easily printed and used to assess the accuracy of the printer. Measurements from the layout were compared with those obtained from a CMM and a caliper. While this new method may not capture the full three-dimensional form error of a cylinder as accurately as a CMM, it provides a practical measure of the apparent diameter, which is critical for successful assembly operations. This simple, cost-effective technique offers a valuable tool for both amateur and professional users to assess and compare the accuracy of different 3D printing processes and machines.