Technologies
Selective Laser Melting (SLM) is a metal 3D printing process that melts metal powder layer-by-layer using a high-powered fiber laser, producing fully dense parts (≥99.5% density) with tolerances of ±0
Selective Laser Melting (SLM) is a metal 3D printing process that melts metal powder layer-by-layer using a high-powered fiber laser, producing fully dense parts (≥99.5% density) with tolerances of ±0.1–0.2 mm directly from a digital CAD file. No tooling is required, making SLM cost-effective for lo
Selective Laser Melting (SLM) is a metal 3D printing process that melts metal powder layer-by-layer using a high-powered fiber laser, producing fully dense parts (≥99.5% density) with tolerances of ±0.1–0.2 mm directly from a digital CAD file. No tooling is required, making SLM cost-effective for low-volume production runs and complex geometries impossible to machine conventionally. For parts requiring tighter tolerances on critical surfaces, CNC machining services in Egypt can finish SLM components to ±0.05 mm post-print.
The SLM workflow begins with CAD file preparation and ends with a finished metal part ready for assembly or post-machining. The process is deterministic and repeatable:
CAD file preparation and STL export — Convert your part design to STL format and undergo design-for-manufacturability (DFM) review to identify overhangs and support structure requirements.
Powder bed preparation — A thin layer of metal powder (typically 30–50 µm thick) is spread evenly across the build platform using a recoater blade.
Laser scanning and selective melting — A fiber laser with 200–400 W power traces the part's cross-section on the powder bed, melting it to full density in that layer only. The laser spot diameter is typically 70–100 µm, enabling fine geometric detail.
Platform lowering — After the laser completes one layer, the build platform drops by precisely 30–50 µm (one layer thickness), and fresh powder is recoated across the entire bed.
Layer-by-layer repetition — Steps 3–4 repeat hundreds to thousands of times until the entire part is built from the bottom up, with internal support structures holding overhanging features.
Cooling and stress relief — The finished part cools slowly inside the machine chamber to minimize residual stress and micro-cracking. Heat treatment follows to achieve final mechanical properties.
Depowdering and support removal — The part is extracted from the powder bed. Unmelted powder is recovered for recycling, and support structures are removed manually or via waterjet.
Post-processing and quality inspection — Parts undergo shot blasting or machining to remove surface powder residue. Critical dimensions are measured against the original CAD tolerance stack. At Entag, we finish SLM parts to ±0.1–0.2 mm on standard features, with CNC post-machining available to achieve ±0.05 mm on critical surfaces.
The three core materials available through Entag's SLM service cover 95% of industrial applications:
316L Stainless Steel (ASTM F138) — Superior corrosion resistance in chemical and offshore environments. Used for pump impellers, manifolds, and fluid control components in Egypt's oil & gas sector and Saudi Arabia's petrochemical plants.
Ti-6Al-4V Titanium (ASTM F2924) — Highest strength-to-weight ratio for aerospace, medical implants, and thermal engine components. Standard in Saudi Arabia's aviation supply chain (Jeddah and Riyadh manufacturers source heavily).
AlSi10Mg Aluminum Alloy — Lightweight structural parts for automotive and aerospace applications. Lower density than steel; ideal when weight-per-strength matters. Common in weight-critical assemblies across Riyadh and Dammam industrial parks.
Material choice depends on operating temperature, corrosion exposure, and load case. Your procurement team specifies the material in the RFQ; Entag confirms availability and delivers certified material certs with each batch. For applications requiring additional precision finishing, sheet metal fabrication in Egypt and tube fabrication services complement SLM for hybrid assemblies.
| Feature | SLM | DMLS | Binder Jetting | Lost-Wax Casting |
|---|---|---|---|---|
| Part Density | ≥99.5% | ≥98% | ~97% (post-sintered) | ~99% |
| Typical Tolerance | ±0.1–0.2 mm | ±0.1–0.2 mm | ±0.2–0.3 mm | ±0.3–0.5 mm |
| Support Structures | Yes | Yes | No | No (mold-dependent) |
| Common Materials | SS 316L, Ti-6Al-4V, AlSi10Mg | Tool steels, Inconel | SS 316L, Inconel | Aluminum, Steel |
| Best For | Complex, high-strength parts | Same — DMLS is EOS branding | Large batches, cost reduction | High volumes, mature geometry |
| Lead Time (Cairo/Riyadh) | 3–7 days (Entag) | 3–7 days | 5–10 days | 2–6 weeks |
DMLS clarification: Direct Metal Laser Sintering (DMLS) is EOS's proprietary name for the same laser-powder-fusion physics as SLM. The terms are functionally interchangeable — both produce ≥98% dense parts with identical tolerances. When comparing quotes, verify the actual tolerance and density spec, not the brand name. For prototyping and rapid iteration, 3D printing services in Egypt offer faster turnaround than traditional manufacturing.
What is SLM 3D printing used for?
SLM produces complex, high-strength metal parts where conventional machining is uneconomical or geometrically impossible — aerospace brackets, medical implants, fuel injector nozzles, and hydraulic manifolds. It's ideal for 1–50 part quantities when time-to-market is critical and material waste must be minimized.
What is the difference between SLM and DMLS?
SLM and DMLS use identical laser-melting physics. DMLS is EOS's brand term; SLM is the generic process name. In practice, engineers treat them identically. Both achieve ≥98–99.5% density and ±0.1–0.2 mm tolerances. Always verify the actual material spec and density claim, not the equipment brand name.
What tolerances does SLM 3D printing achieve?
Standard SLM tolerances range ±0.1–0.2 mm depending on geometry and material. For critical functional surfaces — bores, threaded holes, datum references — post-process CNC finishing can tighten tolerances to ±0.05 mm. Specify critical dimensions explicitly in your CAD file or engineering drawing.
What materials are available for SLM?
The three most common SLM materials are 316L stainless steel for corrosion resistance, Ti-6Al-4V for aerospace and medical applications, and AlSi10Mg aluminum for lightweight structures. Material selection depends on operating temperature, chemical environment, and mechanical load requirements.
How much does SLM 3D printing cost in Egypt?
SLM part cost depends on volume, material, layer thickness, and post-processing. Because there is no tooling cost, SLM is cost-effective for 1–50 parts. Upload your CAD file to request a quote on Entag for an itemized quote within 24 hours; compare SLM pricing against CNC machining to identify the most economical path.
How long does SLM 3D printing take from order to delivery?
Entag's standard lead time is 3–7 business days from order confirmation, covering printing, depowdering, and basic finishing. Parts requiring post-machining, shot blasting, or heat treatment add 2–3 days. Urgent expedited turnaround is available in Cairo, Jeddah, and Riyadh for time-critical projects.
Ready to start your project? Request a quote on Entag — upload your CAD file and get a price in 24 hours.
