## 1 Introduction  
The growing accessibility and declining cost of 3D printing have brought noticeable changes to the manufacturing sector, especially in toy production. Compared with traditional plastic injection molding, 3D printing stands out with its flexibility and ease of customization. However, this shift raises a practical question: how do the mechanical properties of toys made by injection molding differ from those produced via Fused Deposition Modeling (FDM)? This question is particularly relevant in industries where product safety, durability, and cost efficiency are critical--such as toy manufacturing. Toys not only are subject to mechanical stress during play but also require dimensional consistency and surface quality due to regulatory and user expectations. While the layered nature of FDM and its manufacturing potential have been widely discussed, a direct comparison with conventional methods in the context of functional toy parts remains limited. This study aims to address that gap by both experimentally evaluating production methods and supporting the findings with a multi-criteria decision-making framework. Studiesindicate that 3D printers enable the fabrication of customized products from various materials using Computer-Aided Design (CAD) software, SolidWorks and Autodesk or free design packages such as Blender and Google SketchUp, offering benefits such as reduced costs, increased production speed, and minimized inventory risks [1]. Furthermore, the ability to manufacture complex geometries has introduced significant innovations in the design phase, particularly through the Design for Manufacturing (DFM) approach, which integrates design and production in additive manufacturing. This approach helps in balancing production cost, time, and quality considerations, and provides useful insights for aligning additive manufacturing with Design for Manufacturing (DFM) principles, as discussed in [2]. Research into how 3D printing process parameters influence part properties has garnered significant attention. Previous studies have investigated five critical parameters--layer thickness, part build orientation, raster angle, air gap, and raster width--specifically concerning their effect on dimensional accuracy in FDM processes. Experiments conducted with ABS material on an FDM 1650 machine revealed that while thickness generally exceeded target values, other dimensions such as length, width, and hole diameters tended to be lower. The Gray Taguchi method was successfully employed to optimize these process parameters for improved dimensional accuracy [3]. Furthermore, investigations into the effects of FDM process parameters on mechanical properties have demonstrated that factors like extrusion temperature, layer height, and build orientation significantly influence tensile strength and overall mechanical performance [4]. The current study specifically examines how printing speeds (10, 30, 50, and 70 mm/s) affect the tensile strength of ABS samples produced using FDM technology. As anticipated, the lowest printing speed yielded the highest tensile strength [5]. Separately, the changes in the physical properties of ABS, PETG (Polyethylene Terephthalate Glycol), and PLA polymers during heating and cooling were explored when printed via FDM at varying temperatures (85, 105, and 125 \({}^{\circ}\)C). This research concluded that ABS material exhibited the least shape change in response to temperature variations [6]. Polylactic acid (PLA), a widely utilized biopolymer in additive manufacturing, is known for its limited impact strength, which necessitates process optimizations to enhance its mechanical properties. Research has specifically examined the effects of layer height and print bed temperature on PLA's impact resistance. These studies leveraged advanced characterization techniques such as X-ray diffraction (XRD), polarized optical microscopy (POM), and scanning electron microscopy (SEM).