Dozens of metals and metal alloys can be 3D printed today, ranging from common industrial materials like stainless steel and aluminum to high-performance options like titanium, nickel superalloys, and even precious metals like gold and platinum. The list keeps growing as printer technology improves, but the core group of printable metals covers most engineering and manufacturing needs.
Stainless Steel
Stainless steel is one of the most widely used metals in 3D printing, and two grades dominate. 17-4 PH is a precipitation-hardened steel valued for its high tensile strength and corrosion resistance. It shows up in aerospace, automotive, medical, oil and gas, and marine applications. 316L is the more flexible option, literally. It’s more malleable than 17-4 PH and is the go-to for acid-resistant and corrosion-resistant parts in food and beverage processing, pharmaceuticals, chemical plants, and jewelry.
When it comes to strength, 3D printed stainless steel holds up well against traditionally made versions. Forged 316L typically reaches tensile strengths of 570 to 620 MPa, while high-quality 3D printed 316L achieves around 600 MPa after proper heat treatment and densification. That near-parity has made printed stainless steel a practical choice for functional end-use parts, not just prototypes.
Titanium
Ti6Al4V (titanium alloyed with aluminum and vanadium) is the workhorse titanium alloy for 3D printing. Its mechanical properties, including tensile strength, elongation, and hardness, are comparable to wrought titanium produced through conventional methods. Printed Ti6Al4V can reach tensile strengths of 950 to 1,000 MPa, putting it within striking distance of forged titanium’s ceiling of about 1,000 MPa.
Different titanium types serve different industries. Alpha and alpha-plus-beta alloys like Ti6Al4V are lightweight and strong, making them ideal for aerospace load-bearing components and automotive parts like connecting rods and wheel rim fasteners. Beta-titanium alloys have a lower stiffness that more closely matches human bone, which makes them better suited for biomedical implants. Research from Murr et al. found that titanium parts made through electron beam melting actually had superior mechanical properties compared to cast and wrought versions for biomedical implant use.
Aluminum
AlSi10Mg is the standard aluminum alloy for metal 3D printing, comparable to the 3000-series alloys used in traditional casting. It offers a strong strength-to-weight ratio along with good thermal and electrical conductivity, corrosion resistance, and solid fatigue performance. That combination makes it popular in aerospace, automotive, consumer goods, and construction.
Aluminum’s big selling point is weight reduction. Lighter vehicle and aircraft components mean less fuel consumption and fewer emissions. Researchers at Nagoya University recently developed a new printable aluminum alloy containing iron, manganese, and titanium (Al-Fe-Mn-Ti) that outperforms all other 3D printed aluminum materials by combining high-temperature strength with room-temperature flexibility. That could open the door to using printed aluminum in hot environments like compressor rotors and turbine components, where it previously couldn’t survive.
Nickel Superalloys
Inconel 625 and Inconel 718 are nickel-chromium superalloys built for extreme heat and corrosive environments. Inconel 625 maintains an ultimate tensile strength of 558 MPa even at 600°C, which is why it’s used in jet engines, gas turbines, chemical processing equipment, and marine applications. These alloys are classified as highly reactive during printing, requiring careful atmosphere control in the build chamber to prevent contamination.
Inconel is also one of the harder materials to finish after printing. Removing support structures from Inconel parts often requires CNC machining, robotic arms, or wire electrical discharge machining because the material resists the strain of simpler cutting tools like bandsaws.
Cobalt Chrome
Cobalt chrome is another highly reactive alloy that performs well in 3D printing despite needing careful handling during the build process. It’s biocompatible, wear-resistant, and strong at high temperatures. The dental and medical device industries rely heavily on printed cobalt chrome for crowns, bridges, and orthopedic implants, while aerospace uses it for turbine components that need to survive punishing heat cycles.
Copper
Pure copper has been one of the trickiest metals to 3D print. The problem is reflectivity: copper bounces back the near-infrared laser light used in most commercial powder bed fusion printers, preventing the powder from fully melting and fusing. The result was parts with too much porosity and poor electrical conductivity.
The breakthrough came with industrial-grade printers equipped with green lasers operating at 515 nm wavelength. Copper absorbs green light far more efficiently, allowing manufacturers to finally print pure copper parts with the density and conductivity needed for real thermal management applications like heat exchangers, cooling channels, and electrical components.
Precious Metals
Gold, silver, and platinum can all be 3D printed, though the jewelry industry has landed on an indirect approach as its standard. Direct printing of gold using selective laser melting is technically possible, but gold’s high value, extreme malleability, and the need for flawless surface finishes make the process impractical for most jewelers.
Instead, the dominant workflow combines 3D printing with traditional lost-wax casting. A highly detailed wax model is printed using either MultiJet Printing (MJP) or Digital Light Processing (DLP), then that wax model is used as the pattern for casting in gold, silver, or platinum. This gives jewelers the geometric freedom of 3D design with the surface quality and material properties of conventional casting.
Refractory Metals
Tungsten, molybdenum, tantalum, and rhenium sit at the extreme end of the printable metal spectrum. These refractory metals have melting points above 2,000°C and are used in nuclear reactors, hypersonic vehicles, and defense systems. Their extreme temperatures and brittleness make them prone to cracking during printing, which has limited adoption.
A research team at Johns Hopkins Applied Physics Laboratory recently 3D printed a tungsten-rhenium alloy by developing techniques to sidestep the cracking problem. The ability to print refractory metals into complex shapes could unlock new possibilities in energy and national security, where these materials are critically important but historically difficult to form into anything beyond simple geometries.
How Printed Metal Compares to Forged
One of the biggest questions around metal 3D printing is whether the parts are actually strong enough. The answer, for most common alloys, is yes. Modern printing technologies combined with in-process monitoring and post-processing can achieve greater than 99.9% density, rivaling forged components. The titanium and stainless steel numbers mentioned earlier reflect this: printed parts routinely reach 90 to 100% of the tensile and yield strength of their forged equivalents.
The catch is that raw printed parts aren’t finished parts. Nearly every metal 3D print requires post-processing. At minimum, that means removing loose powder from the build and cutting away support structures. Most parts also need stress relief heat treatment to release the internal tensions that build up from rapid heating and cooling during printing. For critical applications in aerospace, medical devices, or energy, Hot Isostatic Pressing (HIP) is common. HIP combines high heat with pressure to eliminate internal porosity, relieve residual stress, and significantly improve fatigue life. Additional steps like CNC machining or surface finishing bring the part to its final dimensions and smoothness.
Liquid Metal Printing
A newer category of metal 3D printing skips powder entirely and jets molten metal droplets, similar to how an inkjet printer deposits ink. Xerox (which acquired Vader Systems) developed one of the first near-commercial liquid metal jet printers using magnetohydrodynamic technology to eject droplets on demand. These systems have successfully printed tin, silver, and several aluminum alloys including 4043, 6061, and 7075. Researchers have also demonstrated pneumatic drop-on-demand printing of copper droplets and even steel, though those remain largely experimental.