Metalic 3D printing in aluminum, copper or stainless is quite difficult and expensive. How can it be made cheaper?
Make a “lost wax” (3d print in wax) or “lost foam” (hand carve styrofoam) for aluminum and have it investment cast, like jewelery.
Or if your able, cheat and 3D print a plastic mold and use something like the Devcon “metal filled epoxies” inside it.
Or have it machined if its not too complex.