The AMB2018-03 test object consists of a rectangular prism of polycarbonate (PC). The rectangular prism is cut from a sheet that was processed by material extrusion (ME) technology, (sometimes referred to as fused filament fabrication or by Fused Deposition Modelling). The primary objectives of AMB2018-03 tests are to predict the primary macroscopic aspects of the print (thickness, mass), the microscopic shape (voids), and the tensile properties. We emphasize that modelers who wish to submit simulation results are free to address any number of challenges. Modelers are also free to simulate any other aspects of the build that they want, and additional validating data will be made available https://www.nist.gov/ambench/amb2018-03-description