No. 6555 Songze Avenue, Chonggu Town, Qingpu District, Shanghai, China
SLS vs. MJF: The Battle of Industrial Nylon 3D Printing
Introduction: Two Titans of Powder Bed Fusion
Hi, I’m Barry Zeng, a manufacturing engineer at Shanghai Yunyan Prototype & Mould Manufacture Factory. When it comes to industrial Nylon 3D Printing, two technologies dominate: SLS (Selective Laser Sintering) and MJF (Multi Jet Fusion). Both use nylon powder (PA12) to produce strong, durable, and heat‑resistant parts. But they differ significantly in speed, accuracy, surface finish, and cost. In this guide, I’ll compare SLS and MJF head‑to‑head — how they work, part quality, material properties, throughput, and total cost. You’ll learn which technology is better for prototyping, for production runs, and for complex geometries. I’ll also share a case study where we switched from SLS to MJF and cut lead time by 60%. Whether you’re an engineer or a procurement professional, understanding SLS vs. MJF will help you choose the right Nylon 3D Printing process for your parts.
Chapter 1: How SLS Works – The Original Powder Bed Fusion
SLS (Selective Laser Sintering) has been around since the 1980s. A high‑power CO₂ laser scans the surface of a nylon powder bed, sintering (fusing) particles together. After each layer, the build platform lowers, a fresh layer of powder is rolled across, and the laser sinters the next layer. Unfused powder supports the part — no need for dedicated support structures. SLS produces isotropic parts (equal strength in all directions) with good mechanical properties. For Nylon 3D Printing, SLS is the industry standard for functional prototypes and end‑use parts. Typical materials: PA12 (nylon 12), PA11, glass‑filled nylon, and carbon fiber‑filled nylon.
Chapter 2: How MJF Works – The Faster Alternative
MJF (Multi Jet Fusion) was introduced by HP in 2016. Instead of a single laser, MJF uses an inkjet array to deposit fusing and detailing agents onto the powder bed. An infrared lamp then passes over the bed, melting only the areas where fusing agent was applied. MJF can print an entire layer in seconds — much faster than SLS scanning. MJF also produces isotropic parts with excellent surface finish. For Nylon 3D Printing, MJF offers higher throughput and lower per‑part cost for medium to high volumes. Materials: PA12, PA11, glass‑filled PA12, and TPU (flexible).
Chapter 3: Speed and Throughput – MJF Wins
Speed is where MJF shines. An MJF machine can print a full build volume (up to 380×284×380 mm) in 10–14 hours. An SLS machine (e.g., EOS P396) takes 20–30 hours for a similar build. Why? MJF processes entire layers at once; SLS scans each point individually. For Nylon 3D Printing of 100+ parts, MJF can be 2–3× faster. This speed advantage translates to lower per‑part cost for production runs.
Typical throughput:
- SLS: 20–30 hours per build.
- MJF: 10–14 hours per build.
If you need parts quickly, MJF is the better choice.
Chapter 4: Accuracy and Surface Finish
Both technologies are accurate, but MJF has a slight edge in surface finish.
- SLS accuracy: ±0.1–0.2 mm. Surface finish Ra 6–12 µm (grainy, matte).
- MJF accuracy: ±0.1 mm. Surface finish Ra 4–8 µm (smoother, less grainy).
MJF parts have a finer, more uniform texture because the fusing agent creates more consistent melting. For cosmetic parts or parts that will be painted, MJF is better. For functional parts where surface finish doesn’t matter, both are acceptable.
Chapter 5: Mechanical Properties – Very Similar
For PA12 (nylon 12), SLS and MJF produce nearly identical mechanical properties.
| Property | SLS PA12 | MJF PA12 |
|---|---|---|
| Tensile strength (MPa) | 48–52 | 48–52 |
| Elongation at break (%) | 15–25 | 15–25 |
| Modulus (MPa) | 1,500–1,800 | 1,500–1,800 |
| HDT at 0.45 MPa (°C) | 100–110 | 100–110 | Isotropic? | Yes | Yes |
For Nylon 3D Printing, both technologies produce parts suitable for functional testing, end‑use components, and low‑volume production. Choose based on speed and cost, not mechanical properties.
Chapter 6: Material Options – SLS Has More Choices
SLS has been around longer, so there are more material options.
- SLS materials: PA12, PA11 (more flexible), PA12 glass‑filled (stiffer, higher HDT), PA12 carbon fiber‑filled (very stiff, lightweight), TPU (flexible), PEEK (high‑temp), and custom blends.
- MJF materials: PA12, PA11, PA12 glass‑filled, TPU. Fewer options, but the most common engineering nylons are available.
If you need carbon fiber‑filled nylon or specialty blends, SLS is the only choice. For standard PA12, MJF is fine.
Chapter 7: Cost Comparison – MJF Wins for Medium Volumes
Per‑part cost depends on volume and nesting density.
- Low volume (1–10 parts): SLS and MJF are similar ($20–100 per part). Setup costs dominate.
- Medium volume (10–200 parts): MJF is 20–40% cheaper because of faster build times and higher nesting density.
- High volume (200–1,000 parts): MJF is 30–50% cheaper. MJF’s speed advantage really shows.
Example: 100 small brackets. SLS: $15 each. MJF: $10 each. For Nylon 3D Printing production runs, MJF is usually more economical.
Chapter 8: Part Size and Build Volume
Both technologies have build volume limits. For large parts, SLS has an advantage.
- Typical SLS build volume: 300×300×300 mm to 500×500×500 mm (some machines up to 700×700×600 mm).
- Typical MJF build volume: 380×284×380 mm (HP MJF 5200).
If your part exceeds 380 mm in any dimension, SLS may be the only option. For most parts, MJF’s volume is sufficient.
Chapter 9: Case Study – Switching from SLS to MJF for Drone Parts
A drone manufacturer needed 200 nylon arms per month. Original SLS process: 24‑hour build time, $18 per part, 5‑day lead time. We switched to MJF: 12‑hour build time, $11 per part, 3‑day lead time. The client saved 40% on parts and received them faster. For this volume, MJF was the clear winner. This shows how Nylon 3D Printing technology choice impacts your bottom line.
Chapter 10: Summary – SLS vs. MJF Decision Matrix
| Factor | SLS | MJF | Winner |
|---|---|---|---|
| Speed (build time) | 20–30 hours | 10–14 hours | MJF |
| Surface finish | Grainy (Ra 6–12 µm) | Smoother (Ra 4–8 µm) | MJF |
| Accuracy | ±0.1–0.2 mm | ±0.1 mm | Tie | Material options | Wide (CF, glass, TPU, PEEK) | Limited (PA12, PA11, glass, TPU) | SLS |
| Cost (medium volume) | Higher | Lower (20–40%) | MJF |
| Build volume | Up to 700 mm | 380 mm max | SLS |
Conclusion: Choose Based on Your Priorities
Both SLS and MJF are excellent Nylon 3D Printing technologies. Choose MJF if you need faster turnaround, smoother surfaces, and lower cost for medium‑volume production. Choose SLS if you need larger parts, carbon fiber‑filled materials, or have a lower budget for machine time. we offer both SLS and MJF — and we help clients choose the right one. Send me your CAD file and quantity. I’ll provide a free DFM analysis, compare SLS vs. MJF costs, and quote your project within 24 hours. Let’s get your nylon parts made the right way.
👇 Need Nylon Parts – SLS or MJF?
Send me your CAD file and quantity. I’ll recommend SLS or MJF based on your speed, surface finish, and cost needs — and provide a free DFM report and quote.
📞
Call Barry
Direct engineering line
(I answer SLS/MJF questions)
+86 138 1894 4170
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Download “SLS vs. MJF Comparison Guide”
(Property table, cost analysis)
Not sure which technology fits your parts? Just say: “Barry, here’s my part — SLS or MJF?” I’ll give you an honest recommendation.
🔥 SLS vs. MJF — The Right Nylon 3D Printing for You 🔥
P.S. Mention “nylon guide” when you email, and I’ll send you a material property chart and a cost comparison spreadsheet.
Barry Zeng
Senior Manufacturing Engineer, Shanghai Yunyan Prototype & Mould Manufacture Factory
(10+ years in industrial nylon 3D printing — SLS and MJF. Let me help you choose the right technology.)
