: Polyethylene terephthalate glycol (PET-G) is a widely used additive manufactured material for industrial applications, particularly in the production of the lightweight Pro model with its intrinsic geometry. High levels of geometric intricacy and remarkable structural strength are possible with techniques for metal 3D printing such as binder jetting, powder bed fusion, and directed energy deposition. To improve quality and reduce costs, it is essential to select the appropriate process parameters in Rapid Prototyping Machining (RPM). Multi-criteria Decision Method (MCDM) techniques such as TOPSIS and PROMETHEE help to achieve optimal results by analyzing parameters like Infill Density (ID), Layer Height (LH), and Nozzle Temperature (NT) to evaluate mechanical properties, including Ultimate Tensile Strength (UTS), Impact Strength (IM), and Compression Strength (CMPS) in accordance with ASTM standards. To evaluate the results obtained, we utilize the methods mentioned earlier. Among the L27 array, the combination of 42% Infill Density (ID), 2350°C Nozzle Temperature (NT), and 0.2 mm Layer Height (LH) has been identified as the best option.

Key words: Rapid prototyping Machining, TOPSIS, PROMOTHEE