This article introduces a hybrid method for assessing the circularity of cylindrical parts produced via Fused Deposition Modeling (FDM). The proposed approach combines a multi-section analysis with the generation of an adaptive reference cylinder, enabling a detailed evaluation of geometric deviations along the build axis. By segmenting the part into transverse profiles, the method captures gradual shape variations induced by the layer-by-layer nature of the additive process. This strategy enhances the understanding of form deviations linked to process parameters and stacking effects, and contributes to more reliable geometric modeling in additive manufacturing.