Bronze, brass, copper, aluminum, and stainless steel are the most common 3D printer filament metal blends. They tend to be around 50% metal powder and 50% PLA or ABS, but there are blends that exist with up to 85% metal. Our MetalFil™ is PLA with 80% metal filling. It 3D prints heavyweight parts which are nearly indistinguishable from genuine casted objects.