Continuous research in the field of additive manufacturing has led to the need of constant improvement of manufacturing parameters according to the workpiece material and functioning conditions. Because of the variety of materials use for the manufacturing of filaments these concerns are especially meet in the case of FDM (Fused Deposition Modeling) manufacturing, in recent years the main directions outlined for productivity and quality improvement were related to higher printing speed and the use of Ironing-type processes. These directions opened new possibilities for materials with an amorphous structure such as ASA (Acrylonitrile Styrene Acrylate) or ABS (Acrylonitrile Butadiene Styrene), due to their tendency to deform during the manufacturing process. This article aims to study the manufacturing parameters on the dimensional accuracy of the ASA material. The degree of novelty is given by the application of the Ironing process on each individual layer, at different ironing angles. A full factorial 43 experimental design was designed for this study, in which the factors studied were ironing angle, nozzle diameter, and layer spacing during ironing. The dimensional accuracy was analyzed by means of reverse engineering technique, by scanning the samples and determining the deviations by using a reverse engineering dedicated program Geomagic Design X. The results allowed the drawing of the variation graphs and the possibility of applying the analysis of variance (ANOVA) which provides information about the degree of influence of each of the studied factors. The study found that a 0.6 mm nozzle diameter achieved the best surface smoothness for ironing ASA parts, while a 0.8 mm nozzle provided the highest dimensional accuracy. Additionally, a smaller ironing spacing of 0.1 mm significantly improved dimensional accuracy, compared to a 0.3 mm spacing, due to enhanced heat distribution and material consolidation.