Technologies
Metal 3D printing is an additive manufacturing process that uses a high-powered laser to fuse metallic powder layer by layer, building a solid, dense functional part from digital CAD geometry. Unlike
Metal 3D printing is an additive manufacturing process that uses a high-powered laser to fuse metallic powder layer by layer, building a solid, dense functional part from digital CAD geometry. Unlike traditional CNC machining, which removes material, metal 3D printing adds material only where needed
Metal 3D printing is an additive manufacturing process that uses a high-powered laser to fuse metallic powder layer by layer, building a solid, dense functional part from digital CAD geometry. Unlike traditional CNC machining, which removes material, metal 3D printing adds material only where needed, enabling complex internal geometries and reducing waste. The process produces parts with mechanical properties approaching wrought material and tolerances of ±0.1–0.2 mm in as-built condition.
CAD file preparation and slicing. Your CAD file (STL or STEP format) is imported into slicing software, which divides the part into thin horizontal layers typically 20–100 µm thick. Support structures are automatically generated to anchor overhanging geometry to the build platform.
Powder bed setup. A thin layer of metal powder (usually 316L stainless steel, AlSi10Mg aluminum alloy, or Ti-6Al-4V titanium) is spread evenly across the build platform inside a sealed chamber filled with inert gas to prevent oxidation.
Laser sintering and melting. A high-powered fiber laser (typically 200–500 watts) traces the cross-section of each layer, melting the powder into a solid dense mass. The laser follows the sliced geometry precisely, fusing powder grains together and bonding each new layer to the one below.
Part cooling in the build chamber. After the laser completes one layer, the platform lowers by the layer thickness, fresh powder is spread, and the process repeats. The part remains hot inside the sealed, inert chamber to minimize residual stress and thermal cracking.
Powder removal and support detachment. Once all layers are complete, the part cools inside the chamber, then is removed and cleaned. Excess powder is recovered and recycled. Support structures are removed mechanically or via post-processing.
Post-processing and finishing. The as-built part undergoes heat treatment (stress-relieving or full annealing) to achieve final material properties. Critical surfaces are then finished: sand blasting, CNC machining, or polishing reduce surface roughness from as-built Ra 6–15 µm to Ra 1.6 µm or better, bringing tight tolerance features down to ±0.05 mm.
| Process | Full Name | Best For | Typical Tolerance | Surface Finish (As-Built) | Common Materials |
|---|---|---|---|---|---|
| SLM | Selective Laser Melting | Functional metal parts, complex geometry | ±0.1–0.2 mm | Ra 6–15 µm | 316L steel, AlSi10Mg, Ti-6Al-4V |
| DMLS | Direct Metal Laser Sintering | Similar to SLM; alloy-specific | ±0.1–0.2 mm | Ra 6–12 µm | Inconel 718, tool steels |
| Binder Jetting | Binder Jetting | High volume, lower strength parts | ±0.2–0.3 mm | Ra 4–8 µm (post-sinter) | Stainless steel, bronze |
| DED | Directed Energy Deposition | Repair, large parts, cladding | ±0.25–0.5 mm | Ra 15–30 µm | Titanium, Inconel |
SLM dominates for precision industrial applications because it delivers the tightest tolerances, best surface finish, and strongest mechanical properties. At Entag, our SLM capability serves engineers across Cairo, Alexandria, Jeddah, Riyadh, and Dammam with parts ranging from intricate cooling channels to lightweight aerospace brackets. For applications requiring even tighter dimensional control, we combine SLM printing with CNC machining to achieve post-processed tolerances of ±0.05 mm and superior surface finish on critical features.
Metal 3D printing material selection drives both mechanical performance and manufacturing cost. 316L stainless steel is the most common choice for corrosion-resistant, general-purpose parts. AlSi10Mg aluminum alloy offers light weight and good thermal conductivity—ideal for aerospace and automotive. Ti-6Al-4V titanium provides extreme strength-to-weight ratio for high-temperature or high-stress environments.
As-built parts from SLM exhibit surface roughness of Ra 6–15 µm due to powder particle embedding and laser scan patterns. For functional applications, this finish is often adequate. For precision assemblies or aesthetics, post-machining improves surface finish to Ra 1.6 µm or better. As-built dimensional tolerance is ±0.1–0.2 mm across the part; after CNC finishing, critical holes and mating surfaces reach ±0.05 mm. Layer thickness (20–100 µm) directly affects build time and surface quality—thinner layers improve finish but extend print duration. Part density typically reaches 99.5%+ of theoretical material density, yielding mechanical properties within 95–105% of wrought equivalents depending on alloy and heat treatment.
What is metal 3D printing and how does it differ from regular 3D printing?
Metal 3D printing uses a high-powered laser to fuse metallic powder layer by layer into a solid, dense functional part. Unlike plastic 3D printing (FDM or SLA), it requires inert gas environments, higher temperatures, and mandatory post-processing such as heat treatment. The result is a fully functional metal component with mechanical properties comparable to wrought or machined parts.
What tolerances can metal 3D printing achieve?
SLM metal 3D printing typically achieves as-built tolerances of ±0.1–0.2 mm. For critical features requiring tighter specs, post-process CNC machining can bring tolerances down to ±0.05 mm. Surface roughness as-built is Ra 6–15 µm, improving to Ra 1.6 µm or better after finishing operations.
What metals can be 3D printed?
Commonly printed metals include 316L stainless steel, AlSi10Mg aluminum alloy, Ti-6Al-4V titanium, Inconel 718, and tool steels. Material choice depends on the part's mechanical requirements, operating environment, and budget. Entag's material engineers can advise on the right alloy for your application.
How long does metal 3D printing take from CAD file to finished part?
Build time depends on part size, geometry complexity, and layer thickness (20–100 µm). A typical industrial part takes 12–48 hours in the build chamber, plus 1–3 days for post-processing. With Entag's on-demand platform, engineers in Egypt and Saudi Arabia receive quotes within 24 hours of CAD file upload.
Is metal 3D printing stronger than CNC machining?
SLM-printed parts can match or approach wrought material strength depending on alloy and build orientation, but CNC machining from solid billet typically achieves superior isotropic mechanical properties. Metal 3D printing wins on geometric complexity—internal channels, lattice structures, and organic geometries impossible to machine. Often, combining both processes delivers the best result.
What file format do I need for metal 3D printing?
The standard file format for metal 3D printing is STL or STEP (.stp). STEP files are preferred for preserving dimensional accuracy and feature data. Entag accepts both formats—upload your file directly at app.entag.co for an instant DFM (Design for Manufacturability) review before production.
Metal 3D printing is ideal for low-volume functional parts, prototypes with complex geometry, and replacement components where lead time matters. Entag's SLM capability is available on-demand—no minimum order quantities, no tooling fees, no long lead times.
Request a quote on Entag — upload your CAD file and get a price in 24 hours. Our platform serves engineers in Cairo, Alexandria, Jeddah, Riyadh, and Dammam. For technical guidance on material selection, design optimization, or post-processing requirements, our DFM team reviews every file before quoting.
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