Metal 3D printing technology using material extrusion has been extensively researched as a cost-effective alternative to laser sintering methods. This process utilizes a plastic filament with up to 90% metal powder, which is then debinded and sintered to create fully metal parts. The study focuses on how feeding speed affects the Copper filament, which contains 90% copper and 10% PLA plastic. Finite element analysis is used to investigate the melting process and rheological properties, examining parameters like speed and pressure at the print head. The results aim to identify optimal feeding speeds, with the selected values ranging from 1 to 2.5 mm/s, and assess their impact on the dimensional accuracy of the printed products.