SLS 3D Printing Services
XC Machining SLS 3D printing sinters PA12, PA11, PA12-GF, TPU, and PP nylon powder layer-by-layer at 100–150 μm resolution using a CO₂ laser — producing functional parts with ±0.3 mm (or ±0.5%, whichever is larger) dimensional tolerance, no support structures required, and isotropic mechanical properties in all three axes. First parts delivered in 2–5 business days from Dongguan, China. No tooling investment required.
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What Is SLS 3D Printing at XC Machining?
Selective Laser Sintering (SLS) is a powder bed fusion (PBF) additive manufacturing process where a CO₂ laser selectively sinters nylon powder particles layer-by-layer at 100–150 μm per layer into solid parts — building complex geometries without support structures because unsintered powder supports the part throughout the build.
Reliable Selective Laser Sintering Printing Company for Precision Parts
Tolerances for Selective Laser Sintering (SLS)
Selective Laser Sintering (SLS) is an advanced 3D printing technology that uses a laser to sinter powdered material into solid structures, layer by layer. The tolerances achieved in SLS depend on the material used and part complexity.
| Specification | |
| Precision Tolerances | Achievable tolerances of ±0.2 mm for most parts, with finer precision possible for smaller geometries. |
| Layer Resolution | As fine as 0.1 mm, depending on the material and printer setup. |
| Minimum Wall Thickness | 1 mm (depending on material type and part design). |
| Minimum Feature Size | 0.5 mm (varies by material). |
| Maximum Part Size | Can vary, typically up to 600 x 600 x 500 mm, depending on the machine capabilities. |
| Minimum Part Size | Can be as small as 5 mm x 5 mm, depending on the printer and material. |
| Production Volume | Low Volume: 1-100 pcs, High Volume: 100-2,000 pcs, Large Volume: 2,000+ pcs (depending on design). |
| Lead Time | Typically 5-7 business days for most orders, with fast turnaround for simpler designs. |
Why Choose XC Machining for SLS 3D Printing Services?
XC Machining SLS 3D printing produces functional nylon parts with ±0.3 mm tolerance, 100–150 μm layer resolution, and no support structures from PA12, PA11, PA12-GF, TPU, and PP powders. Build volume up to 340 × 340 × 600 mm. DFM review within 12 hours. Parts in 2–5 business days from Dongguan, China.
SLS requires no support structures — the unsintered powder surrounding the part during the build acts as the support. This enables internal channels, undercuts, lattice structures, interlocking assemblies, and moving hinges to be printed in a single build without post-removal of support material. No support witness marks, no support removal labor cost, no surface damage from support removal. This is the primary advantage of SLS over SLA and FDM for complex industrial parts.
Multiple parts — or hundreds of identical production parts — are nested in 3D throughout the full 340 × 340 × 600 mm build volume simultaneously. Dense nesting means the per-part cost decreases significantly with quantity: 50 parts per build cost 60–70% less per unit than 5 parts per build. XC Machining's build layout engineers maximize utilization on every production run to reduce your per-part cost.
SLS parts exhibit near-isotropic mechanical properties — tensile strength, elongation, and fatigue resistance are consistent in X, Y, and Z directions — because sintering bonds powder particles in all directions equally. PA12 SLS parts achieve 48 MPa tensile strength in both XY and Z orientations. This makes SLS parts suitable for functional end-use applications where FDM parts (anisotropic, weak in Z) would fail under multi-directional load.
Upload STL or STEP file. XC Machining engineers return DFM review within 12 hours: minimum wall thickness check (≥ 1.0 mm), internal channel clearance for depowdering (≥ 2.0 mm), trapped volume identification, build orientation recommendation, and material selection guidance (PA12 vs PA11 vs TPU vs PP) for your mechanical, thermal, and chemical requirements.
What Surface Finishes Are Available for SLS 3D Printed Parts?
XC Machining SLS parts are available as-printed (Ra 6–12 μm, grainy matte), bead-blasted (Ra 4–8 μm, uniform matte), dyed (Ra 4–8 μm, color penetrates 0.3–0.5 mm), vapor smoothed (Ra 1–2 μm, semi-gloss sealed surface), and painted (RAL/Pantone matched, Ra 1.6–3.2 μm primer+topcoat).
SLS parts emerge from the build with a characteristic grainy, matte surface texture from partially sintered powder particles. Surface roughness: Ra 6–12 μm. No secondary finishing applied — suitable for functional prototypes, fit-and-function testing, internal components, and parts where surface aesthetics are secondary to mechanical performance. Color: natural white/grey (PA12) or natural black (PA11 Black, pre-pigmented powder).
Glass bead or aluminum oxide blasting removes residual sintered powder granules from the as-printed surface, producing a uniform matte finish. Surface roughness: Ra 4–8 μm. Applied to all XC Machining SLS parts as standard before any other post-processing. Improves surface uniformity and prepares parts for dyeing, painting, or sealing. Slightly reduces dimensional tolerance accuracy on critical features (≤ 0.1 mm media removal).
Bead-blasted PA12 White parts are soaked in hot dye solution — black, blue, red, green, yellow available. Dye penetrates 0.3–0.5 mm below the surface — colorfast, not a surface coating that chips or flakes. Surface roughness after dyeing: Ra 4–8 μm (texture unchanged). Used for branded product prototypes, color-coded assemblies, and cosmetic end-use parts. PA12 Black (dyed after printing) vs PA11 Black (pre-pigmented) — XC Machining supplies both.
Two-coat spray painting — primer + polyurethane or epoxy topcoat — applied after bead blasting. Surface roughness: Ra 1.6–3.2 μm. RAL and Pantone color matching. Matte, satin, and gloss finishes (gloss: 85+ GU at 60°). Film thickness: 60–120 μm total. UV-resistant clear coat available for outdoor or display parts. Used for presentation models, trade show prototypes, and end-use consumer-facing parts.
Parts are exposed to a controlled chemical vapor that slightly melts and re-flows the outermost surface, sealing porosity and significantly reducing roughness. Surface roughness after vapor smoothing: Ra 1–2 μm (from Ra 6–12 μm as-printed). Produces a semi-gloss, sealed surface that is water-resistant and improves fatigue resistance by eliminating surface crack initiation sites. Available for PA11 and PA12. Reduces dimensional accuracy by 0.05–0.15 mm on critical features.
Materials for Selective Laser Sintering (SLS) Parts
Leading companies and engineers rely on XC Machining for rapid iterations and durable, high-quality parts. Whether it’s for prototyping or full-scale production, our wide range of materials ensures we meet the unique requirements of any Selective Laser Sintering (SLS) project with precision and speed.
Durable plastic, PA12, PA 2200
Stiff plastic, PA12 GF, PA 3200 GF
Ductile plastic, PA11, Rilsan® Invent Natural
High-performance plastic, carbon-filled PA12, PA 602-CF, carbonamide
Metallic gray plastic, aluminum-filled PA12, alumide
Heat-resistant plastic, mineral fiber-reinforced PA12, PA 620-MF
Meets FAR 25.853 60-second burn specification, PA 606-FR
Our Selective Laser Sintering (SLS) Prototype Manufacturing Capabilities
Provides injection molding for prototypes and custom parts, emphasizing expert support, competitive pricing, and faster production cycles.
Get reliable vacuum casting services for high-quality prototypes and production parts at competitive prices. XinCheng offers highly detailed casting parts with consistent quality.
Uses cutting, bending, and forming techniques to produce precision metal components suited for industrial, commercial, and manufacturing applications.
Specialist Industries
Bring Your Designs to Life with XC Machining
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- Market Reach Expanded
- Advanced Technology Integrated
- Collaborative Innovation Opportunities
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Selective Laser Sintering (SLS) FAQs
What Tolerance Does XC Machining Hold for SLS 3D Printed Parts?
XC Machining SLS 3D printing achieves ±0.3 mm or ±0.5% of the nominal dimension — whichever is larger. For a 100 mm feature, the tolerance is ±0.5 mm (0.5% governs). For a 20 mm feature, the tolerance is ±0.3 mm (the floor governs). Z-axis (build direction) tolerance is the same: ±0.3 mm or ±0.5%. Tolerance is affected by part geometry — large, flat parts and thin features are most susceptible to warping.
Does SLS 3D Printing Require Support Structures?
No. SLS requires no support structures. During the build, unsintered powder surrounding the part acts as a natural support in all directions — supporting overhangs, bridges, internal channels, undercuts, and complex geometries without dedicated support material. This eliminates support removal labor, eliminates support witness marks on part surfaces, and allows internal features (channels, cavities, lattices, moving hinges) that SLA and FDM cannot produce without support removal damage.
What Materials Are Available for SLS 3D Printing at XC Machining?
XC Machining SLS supports: PA12 (Nylon 12 — 48 MPa tensile, 18% elongation, general purpose), PA11 (Nylon 11 — 48 MPa, 40% elongation, bio-based, flexible), PA12-GF (40% glass-filled — 60 MPa, high stiffness for elevated temperature), PA12 Flame Retardant (UL 94 V-0), TPU (flexible, Shore A 80–95, 350% elongation), and PP (polypropylene-like, 22 MPa, chemical resistant, semi-flexible). All materials are sintered in nitrogen atmosphere.
What Is the Lead Time for SLS 3D Printed Parts at XC Machining?
Standard lead time: 2–5 business days for prototype quantities (1–20 parts). 5–10 business days for production batches (50–500+ parts, including build planning and depowdering of fully packed build volumes). Rush delivery: 1–3 business days for simple geometries in PA12 from a pre-scheduled build. DFM review and quote returned within 12 hours of STL or STEP file upload. Shipping from Dongguan, China worldwide.
What Is the Difference Between SLS and MJF (Multi Jet Fusion) 3D Printing?
Both SLS and MJF are powder bed fusion processes using nylon PA12 powder — no support structures, near-isotropic properties, similar tolerances (±0.3 mm). Key differences: MJF uses an inkjet fusing agent + infrared lamp instead of a laser, producing slightly finer surface finish (Ra 4–6 μm vs SLS Ra 6–12 μm) and faster build speeds. SLS offers wider material range (PA11, TPU, PP, FR grades) that MJF does not yet support. XC Machining offers both SLS and MJF — engineers recommend the optimal process during DFM review.
What Is the Maximum Build Volume for SLS 3D Printing at XC Machining?
XC Machining’s SLS build volume: 340 × 340 × 600 mm per build. A single part can occupy the full build volume, or hundreds of smaller parts can be nested in 3D throughout the build. Parts larger than 340 × 340 × 600 mm are produced as multi-piece assemblies bonded with structural adhesive or mechanical fasteners. For very large parts exceeding 600 mm in any dimension, FDM large-format printing (914 × 610 × 914 mm) is the recommended alternative.
When Should I Choose SLS Instead of Injection Molding for Nylon Parts?
Choose SLS over injection molding when: (1) quantity is below 500 units — injection mold tooling ($5,000–$50,000) is not cost-justified; (2) part geometry changes are still anticipated — SLS has $0 tooling modification cost; (3) delivery is required in 2–5 days — injection mold tooling takes 25–35 days; (4) part has internal channels, lattices, or undercuts that injection molding cannot produce. Choose injection molding above 1,000 units per year for lower per-part cost and surface finish quality.
