THE EFFECT OF 3D PRINTING FILAMENT EXTRUSION PROCESS PARAMETERS ON DIMENSIONAL ACCURACY AND STRENGTH USING PLA-BRASS FILAMENTS

3D printing technology, also known as additive manufacturing, is one of the prototyping systems for creating 3-dimensional models (prototypes). One of the most frequently used techniques is FDM (Fused Deposition Modelling) due to its simple working principle of melting the filament material and then extruding it. However, the price of filament used in 3D printing is still quite expensive, especially filaments with a mixture of metals. This study attempts to fabricate filament made of PLA and brass using a self-made extruder machine. The success criteria are determined by the precision of the filament and its strength. The accuracy of the printed filament was measured using a 0.01 mm micrometre, while strength was measured using the pull-out test. Three parameters were used: barrel temperature, material composition and roller speed, with two levels each. Taguchi L4(23) was used to design the experiments, followed by S/N ratio analysis and ANOVA. The results showed that on the dimensional accuracy, the influential parameters were temperature and roller speed, for the optimal parameter level at a temperature of 95oC, composition 10/30 g, and roller speed 3.02 mm/s. As for the single filament tensile test, the parameters that affect it are temperature and composition. For the optimal parameter level at a temperature of 100oC, the composition is 10/30 g, and the roller speed is 2.70 mm/s.