PA12 (SLS) 3D Printing Material (SLS)

What Is PA12 (SLS)?

Nylon PA12 is the most widely used SLS material - durable, chemically resistant, and dimensionally stable. The powder bed self-supports the build, so complex geometry, internal channels, and nested assemblies print without supports, making it ideal for functional prototypes and low-volume end-use parts.

Nylon Polyamide 12 - SLS, printed with Selective Laser Sintering (SLS). Every order is reviewed by our engineering team - no minimum order quantity.

When to choose PA12 (SLS)

Choose SLS PA12 when you need strong, isotropic parts with complex geometry - internal channels, undercuts, nested assemblies, or lattice structures - that FDM cannot print without heavy support. SLS PA12 is the workhorse of functional 3D printing: 48 MPa tensile, good chemical resistance, 154 °C heat deflection, and near-isotropic strength because the powder-bed process does not create the weak Z-axis layers that FDM does.

For parts that need more toughness and flexibility - snap-fits that must survive repeated assembly, living hinges, impact-prone components - SLS PA11 is the better nylon. PA11 has higher elongation (40–50% vs 15–20%) and absorbs impact energy that would crack PA12.

If you need finer features, tighter repeatability, or are producing 50+ identical parts, MJF PA12 may be more cost-effective - Multi Jet Fusion builds faster across full trays and typically achieves slightly better surface detail. SLS offers a larger build envelope (350 x 350 x 550 mm vs 380 x 285 x 380 mm for MJF), which matters for oversized parts.

Material Properties

Representative values - process- and orientation-dependent. Full technical datasheet available on request.

Process

Selective Laser Sintering (SLS)

Tensile strength

48 MPa

Elongation at break

15–20%

Flexural modulus

1,730 MPa

Heat deflection (HDT)

154 °C @ 0.45 MPa

Density

1.01 g/cm³

Max build size

≈ 350 × 350 × 550 mm

Min wall thickness

0.8 mm

Resolution / layer

≈ 110 µm

Relative cost

$$$ (1 = lowest, 4 = highest)

Design Guidelines

Plan features to print reliably and assemble cleanly in PA12 (SLS). Need DFM help?

Min wall

0.8 mm - 1.0 mm+ recommended

Min feature

0.75 mm - fine detail limit

Min hole Ø

1.5 mm - prevents powder entrapment

Drainage

≥ 3 mm holes - for hollow sections

Dimensional tolerances

Typical tolerance is ±0.3 mm or ±0.3% (whichever is greater). SLS achieves more consistent accuracy than desktop FDM because the powder bed provides uniform thermal support. Features smaller than 0.75 mm may not resolve reliably. Post-machining (CNC, drilling, tapping) is available and common for critical bores and sealing surfaces.

Printing notes

SLS PA12 parts are produced on industrial powder-bed systems. Parts are sintered from nylon powder at approximately 170-180 °C using a CO2 laser in a nitrogen-atmosphere chamber. The powder bed acts as support material, so no support structures are needed. Parts cool slowly (12-24+ hours depending on build volume) to minimize warping and maximize mechanical properties. Z-axis mechanical properties are 80-90% of XY, and surface finish varies by angle relative to the laser path.

How PA12 (SLS) Compares

PA12 (SLS) alongside related materials.

	PA12 (SLS)	PA11 (SLS)	PA12-GF	PA12 (MJF)
Tensile strength	48 MPa	47 MPa	38 MPa	48 MPa
Heat deflection (HDT)	154 °C @ 0.45 MPa	157 °C @ 0.45 MPa	175 °C @ 0.45 MPa	175 °C @ 0.45 MPa
Flexural modulus	1,730 MPa	≈ 1,100 MPa	3,300 MPa	1,730 MPa
Elongation	15–20%	40–50%	3–5%	15–20%
Density	1.01 g/cm³	1.02 g/cm³	1.30 g/cm³	1.01 g/cm³
Relative cost	$$$	$$$	$$$	$$

When to Use PA12 (SLS)

Where PA12 (SLS) fits, where it doesn't, and what to use instead.

Functional prototypes and end-use parts

48 MPa tensile with near-isotropic strength (Z-axis 80–90% of XY) - the closest any printed polymer gets to injection-molded nylon performance.

Engineering

Internal channels and fluid manifolds

Powder-bed self-support lets you print tortuous internal channels, baffles, and plenum chambers that would require multi-piece assembly in FDM.

Engineering

Snap-fits and clip assemblies

15–20% elongation provides enough ductility for snap arms to deflect and return over hundreds of assembly cycles without fatiguing.

Consumer Products

Air ducts, shrouds, and housings

154 °C HDT handles engine-bay and under-dash temperatures, while complex duct geometry prints as a single part without supports.

Automotive

Low-volume production runs (10–500 units)

Parts nest in the build volume to fill trays - per-part cost drops 30–50% at 20+ units compared to single-part builds, with no tooling investment.

Consumer Products

Strengths

Near-isotropic strength at 48 MPa tensile - Z-axis retains 80–90% of XY, unlike FDM where Z is typically 40–60%
Full design freedom: internal channels, undercuts, nested assemblies, and lattices print without supports in the self-supporting powder bed
Resists most oils, greases, hydrocarbons, and many solvents - viable for fuel-system, hydraulic, and chemical-contact components

Keep in mind

Matte, slightly grainy as-printed surface with Ra ~10–15 µm - media tumbling or dyeing recommended for cosmetic or handled parts
Hollow sections trap unsintered powder - include drainage holes (≥3 mm) in every enclosed cavity or the part ships with loose powder inside
SLS parts are inherently microporous - for watertight or pressure-rated applications, seal with infiltrant and design walls at 2.0 mm+ minimum

Not the right fit?

Impact toughness and high elongationPA11 (SLS)Finer features and production repeatabilityPA12 (MJF)Maximum stiffnessPA12-GF (SLS)

Finishes & Colors

Finishing options and in-stock colors for PA12 (SLS).

Standard

De-powdered, matte gray/white finish.

Best for: Functional parts

Media Tumbled

Smoother, satin surface and reduced friction.

Best for: Handled / sliding parts

Dyed Black

Acid dye penetrates the surface; no dimensional change.

Best for: Cosmetic uniformity

In-Stock Colors

White

Black

Gray

Custom colors and dyeing available on request. Contact us for options.

PA12 (SLS) FAQ

No. The unsintered powder supports each layer, so there are no printed supports, no support scarring, and full freedom for internal channels and undercuts.

PA12 is the versatile default with strong all-round properties; PA11 is more ductile and impact-resistant and is bio-based. Choose PA11 when you need flexibility and toughness over stiffness.

Both produce strong PA12 parts with similar mechanical properties. MJF typically gives finer features, better repeatability, and faster throughput for runs of 50+. SLS offers a larger build volume (up to 550 mm tall) and works well for smaller quantities and oversized parts.

Yes. SLS PA12 accepts acid dyes (black is most common) that penetrate 0.5–1.0 mm into the surface with no dimensional change. It can also be primed and painted. We offer dyed-black and media-tumbled finishing.

SLS parts are inherently slightly porous. For watertight applications, we can seal parts with infiltrants or coatings. Design walls at 2.0 mm+ minimum and discuss sealing requirements at quote.

We hold ±0.3 mm or ±0.3% on SLS PA12. Accuracy is more consistent than FDM because the powder bed provides uniform thermal support. Critical bores can be drilled or reamed after printing.

SLS PA12 is cost-effective for runs of 10–500 parts, especially complex geometries. Per-part cost drops significantly at 20+ units because multiple parts nest in a single build. For 500+ identical parts, injection molding typically becomes cheaper.

PA12 resists most oils, greases, hydrocarbons, and many solvents. It is not resistant to strong acids or phenol-based compounds. For applications involving specific chemicals, consult the TDS or contact us with your chemical environment.

Technical Documents

Download TDS (PDF)

PA12 (SLS) 3D Printing Material