3D printing / SLS

Selective Laser
Sintering (SLS)

Functional Nylon Parts for Complex Designs

From functional prototypes to low-volume polymer components, without production tooling.

Request an SLS Quote Explore design guidelines

Photography to be addedGeometry with a purpose.

SLS nylon housing or duct showing a complex functional feature.

Why Choose SLS?

SLS fuses polymer powder layer by layer. Surrounding powder supports the build, so suitable complex shapes can be produced without conventional printed supports.

GPT Precision reviews your CAD models, material requirements, quantities and critical features to assess the manufacturing approach.

Complex Geometry

Undercuts, internal channels and interconnected features can be produced without support attachment points. Enclosed cavities still need access for powder removal.

Functional Evaluation

Assess fit, assembly behavior and selected mechanical requirements using engineering polymers. Suitability depends on the material grade, geometry, loading and environment.

Flexible Quantities

Avoid injection mold tooling for design revisions, prototypes and selected low-volume parts. Evaluate the economics against part size, finishing and repeat demand.

Efficient Batch Builds

Parts can be packed in three dimensions to share build preparation and processing. Unit cost also depends on build height, material, cooling, powder recovery and inspection.

Typical SLS Parts & Applications

Start with what the component needs to do, then identify the features that control performance.

Housings & Protective Covers

Equipment enclosures with integrated mounts and internal clearances.

Review: Wall sections, fastening features and mating interfaces.

Ducts & Airflow Components

Complex routing and internal passages in a single polymer component.

Review: Cleaning access, internal surfaces and leakage requirements.

Clips & Brackets

Snap-fit features, mounting brackets and assembly components.

Review: Deflection, load direction, fit and repeated use.

Lightweight & Robotic Parts

Frames, sensor mounts and equipment attachments.

Review: Load paths, vibration, weight and operating conditions.

Fixtures & Replacement Parts

Assembly aids, positioning tools and selected low-volume end-use components.

Review: Contact surfaces, wear, repeatability and acceptance criteria.

Photography to be addedForm, fit and function.

A housing, duct and bracket photographed together; no customer identifiers.

Choose Materials Around the Function

PA12 and PA11 are common starting points for SLS. Compare the actual grade data with the stiffness, flexibility and environment your part requires.

PA12 — Balanced Performance

A balance of stiffness, toughness and dimensional stability for housings, brackets and general-purpose functional parts.

Review: Sustained loading, operating temperature, environmental exposure and critical fits.

PA11 — Greater Ductility

Often considered for flexible clips, snap-fits and impact-loaded parts requiring greater elongation than typical PA12 grades.

Review: Required stiffness, deflection, repeated flexing and fatigue data.

Other Materials to Evaluate

Glass-Filled PA12: Increased stiffness, with trade-offs in ductility, impact behavior and surface finish; thermal performance depends on the grade.
TPU: Elastomeric behavior for grips, covers and cushioning. Assess hardness, compression, porosity and any sealing requirement.

All grades and availability, including PA12 and PA11, require confirmation. Use manufacturer datasheets and agreed testing to assess suitability.

Design for SLS

Plan for printing, cooling and powder removal together. Review these five risks before committing to the finished geometry.

Conceptual cross sections only. Opening size, number and location require review for the actual part; not a dimensional design guide.

Powder Removal

Closed cavities trap unfused powder. Provide accessible cleaning routes; opening size, number and location depend on the cavity and cleaning method.

Thin Features

Slender walls, pins and edges may distort or break during cleaning. Assess material, orientation, feature length and loading rather than using one universal minimum thickness.

Section Transitions

Abrupt thickness changes can produce uneven cooling and warping. Review gradual transitions, large flat surfaces and long features.

Fits & Clearances

Allow for material behavior, orientation, dimensional variation and finishing. Validate critical moving interfaces and snap-fits with samples before repeat production.

Small Holes & Channels

Partial fusion and retained powder can restrict fine passages. Confirm manufacturability, cleaning access and a practical inspection method.

Surface Finish & Post-Processing

SLS starts with a matte, granular surface. Choose a finish around the visible faces, contact surfaces and dimensions that must remain controlled.

Depowdered

Result: Matte, fine-grained texture.
Consider for: Engineering evaluations where cosmetics are secondary.
Review: Accessible powder is removed; the surface is not equivalent to polished or molded plastic.

Mechanical Smoothing

Result: Reduced roughness and a more uniform feel.
Consider for: Handling and appearance requirements.
Review: Tumbling can round edges and alter small features or precision interfaces.

Dyeing

Result: Color on compatible polymer parts.
Consider for: Visual identification or appearance.
Review: Color uniformity and penetration vary with material, geometry and surface condition.

Vapor Smoothing

Result: A smoother surface on compatible materials.
Consider for: Surface feel and cleanability requirements.
Review: Fine details and dimensions can change. Do not assume leak-tightness without validation.

Confirm process availability, material compatibility and acceptance criteria before selecting a finish.

Photography to be addedDefine the delivered surface.

Matched samples showing granular nylon and a verified finishing option.

SLS Compared with Other Manufacturing Processes

Different processes solve different manufacturing problems. Select the process based on the finished component's requirements.

Swipe horizontally to compare all columns.

Process	Best considered when	Main trade-off
SLS	Functional polymer parts, complex geometry and low-volume batches	Granular as-printed surfaces, powder-removal and dimensional constraints
SLA	Fine visual detail and smooth presentation surfaces	Resin properties may not represent the intended production material
MJF	Powder-bed polymer parts, batch production and functional applications	Material and process availability, finish and dimensional behavior vary
CNC Machining	Defined stock material properties, precise interfaces and machined surfaces	Access limitations, material removal and machining setup

Considering injection molding? Repeat demand may justify tooling, while design changes add cost. Compare total project cost, material requirements and inspection needs.

Selected SLS parts may benefit from secondary machining, inserts or assembly operations; confirm the scope during review.

From CAD to Finished Parts

Review

Assess the model, drawings, intended function and critical features.

Plan

Confirm material, quantity, orientation, build packing and finishing requirements.

Produce

Print, cool the build and remove accessible unfused powder.

Verify

Complete agreed finishing and inspection against acceptance criteria before delivery.

Quality & Dimensional Control

Define the Critical Features Before Production.

SLS dimensional results depend on geometry, size, orientation, material and processing conditions.

Rather than applying one tolerance value to every feature, identify the dimensions that control assembly, movement or function.

What Should Be Defined?

Critical mounting holes and locating features
Mating surfaces and assembly clearances
Internal passages requiring powder removal
Wall thickness and structural features
Surface finish and cosmetic requirements
Material grade and required documentation

Inspection Based on Part Requirements

Dimensional checks, fit evaluations and other inspection methods can be planned around agreed drawing requirements.

Where tighter control is needed, consider sample validation, design allowances or secondary machining.

Build size, layer thickness and achievable tolerances will be confirmed against the selected manufacturing equipment and project requirements.

Frequently Asked Questions

Does SLS require support structures?

Conventional printed supports are normally unnecessary because surrounding powder supports the part. Cleaning access and fragile features still need design review.

Can SLS parts be used in service?

Selected applications may be suitable after material and design review. Load-bearing, fatigue-sensitive, safety-critical or environmentally exposed parts may need additional validation.

Can I specify a smoother finish?

Yes, as a requirement for review. Available methods depend on material and geometry; agree on appearance and dimensional acceptance criteria before production.

Can internal channels be cleaned?

Only where geometry and access allow adequate powder removal. Deep or narrow passages need particular review, including how cleanliness will be checked.

Is one part or a batch more economical?

SLS can accommodate individual prototypes and batch builds. Geometry, material, finishing and tooling alternatives determine the economics; more parts do not guarantee a lower unit price.

What determines quotation timing?

Timing follows the initial review of complexity, material, quantity and engineering requirements. Send the model, drawing, application and finished-condition requirements together to reduce clarification rounds.

Request Your SLS Quote

Share your CAD files and what the part needs to do. GPT Precision will review the requirements and discuss a suitable manufacturing approach.

Request an SLS Quote

Include with Your Inquiry

3D model and applicable engineering drawings
Quantity and expected repeat batches
Material preference or mechanical requirements
Critical fits, loads and operating environment
Finish, inspection and documentation requirements