SLS vs MJF — two powder-bed nylon processes, different trade-offs.
SLS (Selective Laser Sintering) and MJF (HP Multi Jet Fusion) both produce production-grade nylon parts in a powder bed. They look similar in output, but the underlying physics are different — SLS uses a laser to fuse powder point by point, while MJF uses an inkjet head to deposit fusing agent across the entire layer at once. Those differences show up in surface finish, batch speed, and consistency. We run MJF because we believe it is the better fit for our production profile. Here is why.
Detailed comparison
Property-by-property breakdown
| Factor | MJF | SLS |
|---|---|---|
| Fusing method | Inkjet fusing agent + IR lamps | CO2 laser point-by-point |
| Layer speed | Entire layer at once | Raster scan (slower) |
| Surface finish (as-built) | Smoother (10–15 Ra μm) | Slightly rougher (15–25 Ra μm) |
| Typical batch time | Faster | Slower at same build volume |
| Dimensional consistency | Excellent batch-to-batch | Very good |
| PA12 tensile strength | 48 MPa | 48 MPa (similar) |
| Material catalog | PA12, PA11, PA12 GF | PA12, PA11, PA12 GF, TPU, specialty |
| Color options | Grey, black (ours) | Off-white |
Our recommendation
Choose MJF for faster batch throughput, smoother as-built surface, and more consistent mechanical properties across a build. Choose SLS when you need specific specialty powders (glass-filled with certain fill percentages, TPU powders, or carbon-filled variants) that are not available in MJF yet.
FAQ
Frequently asked questions
Is MJF better than SLS for production?
MJF offers faster batch throughput because it fuses entire layers at once (inkjet + IR) vs SLS laser point-by-point scanning. MJF also produces slightly smoother surfaces (10–15 Ra μm vs 15–25 Ra μm) and more consistent batch-to-batch properties.
Do SLS and MJF use the same materials?
Both offer Nylon PA12, PA11, and PA12 Glass Filled. SLS has a broader specialty catalog including TPU powders and carbon-filled variants not yet available on MJF. For standard nylon production, the material options overlap.
What is the surface finish difference between SLS and MJF?
MJF produces smoother as-built surfaces at 10–15 Ra μm compared to SLS at 15–25 Ra μm. Both produce matte, slightly grainy finishes. Vapor smoothing can improve either.
Why does Makelab run MJF instead of SLS?
Makelab runs MJF because it delivers faster batch throughput, smoother surfaces, and more consistent mechanical properties across builds. For our production profile of 5,000+ parts per week, MJF is the better fit.
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MJF 3D Printing Service
HP Multi Jet Fusion 3D printing in Nylon PA12, PA11, and PA12 Glass Filled. Batch-consistent production parts in 3–5 business days.
Injection Molding Alternative
Skip the $30K-$100K tooling investment. Production-grade FDM, SLA, and MJF parts with zero mold cost and 3–5 day lead times.
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Choose FDM for early prototyping, concept models, and large parts where cost matters more than surface finish. Choose MJF when you need production-grade mechanical properties, batch consistency, and parts that can ship to end customers.
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Choose SLA when surface quality and dimensional precision are the priority — client presentations, snap-fit prototypes, and parts that need painting. Choose MJF when mechanical performance and batch consistency matter — production parts, functional testing, and parts that ship to customers.
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Switch to Nylon PA12 Glass Filled when: the part does not see sustained high temperatures (above 120°C), does not need to conduct heat or electricity, has complex internal geometry, or needs to be lightweight. Stay with machined aluminum when: the part operates in high heat, must carry electrical current, needs precision under ±0.1mm, or must be compatible with aggressive chemicals that degrade nylon.
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