3D printing of metals is being done in earnest, although the industry prefers the term Additive Manufacturing. Metal powder bed fusion is a stable, reliable process that is being successfully used commercially. It's generally confined to high-value applications that require extreme geometric complexity, but it can be invaluable in industries like aerospace, motorsport and medical. The range of viable materials is still somewhat limited, but covers a good range from titanium and aluminium alloys through to tool steels and heat-resistant super-alloys.