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Superior Aesthetic and Physical Properties of 3D Printer Metal Filament
Metallic Sheen, Surface Realism, and Post-Processing Potential
3D printer metal filament produces results with a level of realism that standard thermoplastic materials, such as PLA and PETG, can never reach. These filaments are infused with metal powders, in most cases, stainless steel, bronze, copper, or nickel. This results in parts with genuine metallic luster, such as brushed steel or warm antique bronze. This form of realism is crucial as a framework for prototypes and models that will eventually become consumer-facing and need to be displayed. Equally important is the fact that these parts can be worked to a much higher level of quality and finish, such as sanding and polishing, or worse, patination, and clearcoat, to extend and simulate the finish of a fine jewelry. All of these options create the potential for weathering and effects that cannot be achieved using standard Fused Deposition materials. This makes metal filament an ideal candidate for replicas of architectural hardware as well as luxury packaging mockups and functional art.
Increased Density and Tactile Heft Compared to PLA, PETG, or ABS
Metal filaments contain, on average, 80-90% metal powder. When contrasted to PLA or ABS, this results in part that are 2 to 3 times as dense. This translates to significant weight and a sense of gravitas to the tactile feel of the finished piece. This is especially desirable for parts serving as a handle and grip like camera grips, knobs, and even tool handles. Metal filament parts can even be made to have similar mass to the metal parts they are designed to represent. Even the form of a metal filament part helps to communicate metal's inertia and weight, which can be lacking in an equally designed form made using a thermoplastic FDM material. This especially helps in the area of product development when parts and components need to be designed to communicate and preserve a level of trust in the product and its use to the end user.
Improved Performance from Mechanical and Thermal Perspectives
Strongest Thermoplastic Option
With the integration of metals, composites retain strength and stiffness far exceeding those in standard thermoplastic options. The composites increase stiffness by about 60% and tensile strength by about 30-50% compared with PLA and ABS, according to tests D638 and D790 from leading filament suppliers. The ability to retain shape under load, combined with the ease of 3D printing, means that the composites can be used to create functional and load-bearing items, such as end-user items and test items. Lastly, the composites we offer are a compromise between prototyping and low-volume production runs.
Improved Heat Deflection Temperature
In addition to the above, the metal composites have better thermal performance than other options. When tested against ABS and PETG, metal composites scored 40-60°C higher in Heat Deflection Temperature (HDT). This trait makes metal composites ideal for automotive applications and printed parts such as custom heat sinks and enclosures for electronics. Metal-infused parts outlast plastic options.
Critical Considerations: Abrasiveness, Hardware Compatibility, and Printing Stability
Nozzle Lifespan and Suggestions for Hardened Steel or Ruby-Tipped Nozzles
Brass nozzles wear out quickly due to metal particles embedded within these filaments. Expect a lifespan of 20–40 hours of printing. After that, printing becomes inconsistent, and nozzles widen, leading to a loss of function. Hardened steel nozzles are a significant improvement since their lifespan is extended 3–5 times compared to brass. For high-volume, high-precision applications, ruby-tipped nozzles are warranted. They are the most cost-effective option due to extreme abrasion resistance. Failing to select the right hardware will result in an unpredictable failure, loss of dimensional accuracy, and minimal sustainability of the printing process, which can cause significant issues in part production.
Situations Where 3D Printing with Metal Filament is Justified
While 3D printing with metal filament cannot replace a complete set of manufacturing processes, it can complement other metal-like manufacturing processes where configuration requirements are low, and the final product value is high. In these cases, the processes that complete the manufacturing (such as CNC machining or injection molding) may have a cost prohibitive configuration for each use, long lead times or geometric constraints.
Rapid Prototyping and Functional Testing. Using metal filament printers will allow engineering teams to complete metal prototyping in-house for less than $10,000, and avoid the time-consuming and expensive outsourcing processes. 3D printed parts can be used to validate designs that are at higher stress and at higher risk for failure during service than standard polymer prototypes. This can be done before committing to expensive metal tooling.
Small Runs and Replacement Parts. Metal filaments allow production without costly molds for smaller runs averaging multiple dozens to several hundred parts. Typical applications include custom heat sinks and inserts for polymer injections, and parts for legacy equipment. After being debound and sintered (98% of theoretical density, according to BASF Forward AM) these parts meet or even exceed performance demand for metal parts produced by traditional methods.
Custom Tools and Fixtures. Metal filaments allow production of lightweight, topologically optimized jigs, fixtures, and assembly aids. The stiffness and thermal conductivity of these tools, improved over their plastic alternatives, provide on-demand production, reducing inventory investments and expediting factory layout changes.
Components for Aerospace, Automotive, and Medical Applications. Early adopters of this technology focus on production for mission-critical applications made from metal filament. Topologically optimized brackets which artel consumer, lightweight, and unyielding, are printed by aerospace teams. Automotive engineers use the technology for the rapid prototyping of custom intake manifolds and mounting brackets and the technology increases the efficiency of medical device developers and the quality of titanium-based surgical instruments. Additionally, the technology now enables a more effective and less invasive approach for the production of custom surgical implants.
Metal filament printing (which requires debinding and sintering) can easily be incorporated into small machine shops and contract manufacturers with some thermal processing capacity. For those companies, technical, third-party sintering of production runs offers an easy to adopt, low-risk technique for testing parts and workplace performance before proving production on a large scale.
FAQs
What are the components of metal filament in 3D printing?
3D printing metal filament is a composite consisting of a polymer matrix, like PLA or PETG, which is then infused with a dispersion of fine metal powders, like stainless steel, bronze, or copper.
What advantages do metal filaments provide compared to other thermoplastics?
Metal filaments provide a significant improvement in aesthetics, density, mechanical strength, and thermal characteristics compared to traditional thermoplastics, which makes them suitable for more accurate and more durable applications.
Will using metal filaments require additional investments in hardware?
Yes, metal filaments are highly abrasive, which does mean that you would need to invest in specialized nozzles, thermally resistant nozzles, or ruby-tipped nozzles, as traditional brass printing nozzles would wear out and not print consistently.
Where is the use of 3D printed metal filaments predominant?
3D printed metal filaments are widely used in the aerospace, automotive, and medical industries, as well as in areas of rapid prototyping, small scale production, and specialized tools and high speed components.
Is post-processing a necessity for metal filament prints?
It is very common for prints to be high quality but require post-processing to achieve optimal performance. This includes debinding and sintering. Coatings, polishing, and patinas can also be used to improve appearance and add protection.