MAKENEXAComplex unsupported geometry
Internal channels, organic forms and consolidated features may benefit from powder-bed support when trapped powder can be removed.
Manufacturing service decision
SLS 3D printed parts in functional polymers
Source selective laser sintering for prototypes, end-use components, housings, ducts, clips and complex polymer geometry. MakeNexa reviews the material specification, part envelope, wall and feature design, orientation-sensitive requirements, post-processing, quantity and inspection plan before confirming the route.
- CAD nowSTEP or native model under one revision
- DrawingCritical dimensions, finish and notes
- QuantityFirst order and any repeat context
- MaterialGrade, condition or open alternatives
- TimingTarget date or priority window
Ready to quote this part?Upload CAD for a reviewed quote across MakeNexa’s supplier network.
Get a QuoteRoute decision
Use SLS when geometry and batch efficiency matter more than a molded surface
SLS builds polymer parts in a powder bed without dedicated support structures, which can make enclosed passages, nested builds and mechanically functional shapes practical. That freedom does not remove design constraints. Thin features, powder escape, large flat surfaces, mating interfaces, threads, snap behavior and cosmetic expectations still need review, and the as-built surface is not equivalent to an injection-molded or polished finish.
MakeNexa compares SLS with MJF, FDM, SLA, CNC machining and molding based on function rather than process familiarity. The RFQ should identify the exact material family or performance requirement, critical interfaces, operating environment, appearance zones and repeat demand. Build orientation, nesting, machine, refresh strategy, post-processing, supplier, tolerance, price and lead time remain project-specific until the reviewed quote states them.
Best-fit parts and programs
Where SLS can be a useful candidate
These are routing signals; final suitability depends on material, geometry and acceptance requirements.
Functional polymer prototypes
Housings, brackets, clips and ducts can be evaluated in a real printed polymer without molding tooling.
Mixed or repeat batches
Build nesting may support multiple parts or variants when quantity, envelope and scheduling align with the supplier route.
Low-volume end-use parts
SLS can support selected production applications when material records, surface, consistency and inspection needs are defined.
Feasibility checks
SLS requirements that deserve early review
Powder-bed freedom can hide cleaning, surface and dimensional constraints that affect acceptance.
Powder removal
Blind cavities and channels need access for depowdering; escape paths and cleanliness criteria should be visible in the design.
Surface and color
As-built texture, media finishing, dyeing and coating change appearance and sometimes edge or dimensional condition.
Warp and flatness
Broad thin surfaces, uneven mass and long spans can move during building or cooling and need route-specific assessment.
Small features and fits
Pins, holes, slots, threads and snap interfaces should be marked by function and reviewed with orientation and finishing in mind.
Route options
Routes compared with SLS
The selected route should support the required material behavior, detail, surface and quantity.
MJF
Compared for powder-bed polymer parts where available materials, dimensional behavior, surface and production pattern fit the job.
FDM or SLA
Considered when cost, scale, material behavior, fine detail or smooth presentation surfaces carry more weight.
CNC or molding
Compared when stock-grade properties, tight interfaces, finish, repeat volume or tooling economics change the decision.
Decision comparison
Typical SLS process values used in review
Typical published values for laser-sintered PA12, the most common SLS material. Machine, powder refresh rate, nesting density and post-processing all move these figures, so the project requirement is confirmed on the reviewed quote rather than read off this table.
| Process variable | Typical published value | What to state in the RFQ |
|---|---|---|
| Layer thickness | 0.1 mm is the usual production setting; 0.06 mm is used where fine detail justifies the longer build | Features whose detail depends on the finer layer |
| Dimensional accuracy | Commonly quoted as ±0.3 mm or ±0.3% of the nominal length, whichever is larger | Critical fits, so they can be nested and measured deliberately |
| Minimum wall | 0.8 mm is the usual floor for a self-supporting wall; 1.5 mm and above where the wall carries load or spans a large flat area | Whether a thin wall is cosmetic, structural or a flexure |
| Powder escape | At least two escape holes of 4 to 5 mm diameter per enclosed volume; unrelieved cavities trap sintered cake that cannot be removed later | Every internal volume, its openings, and the cleanliness the application needs |
| Moving-part clearance | 0.5 mm between surfaces that must move relative to each other after depowdering; 0.3 mm on small assemblies at the risk of fusing | Which interfaces must move as printed rather than after assembly |
| As-built surface | Ra 8 to 15 µm with a uniform matte grain; media finishing, dyeing or vapour smoothing improves it as separate operations | Cosmetic zones, colour reference and whether finishing may soften edges |
| PA12 mechanical behaviour | Published values near 48 MPa tensile strength, 1.7 GPa modulus and a density around 1.0 g/cm³, with roughly 15% elongation at break | The load case and any elongation or impact requirement |
| Temperature limits | PA12 melts near 180 °C, with a heat-deflection figure around 95 °C at 1.82 MPa | Service temperature including transport, cleaning and sterilisation |
| Build envelope | Common production machines build within about 330 × 330 × 600 mm, and cost follows the volume a part occupies in the nest | Envelope, batch quantity and whether parts may be reoriented for nesting |
Quote inputs
Prepare an SLS printing RFQ
Keep material, geometry and post-processing under the same revision.
Complete packages move faster: revision-matched CAD, critical dimensions, quantity and material notes are enough to open engineering review across the network.
Get a Quote- 01
Watertight 3D model and drawing for controlled requirements
- 02
Material grade or functional properties and permitted alternatives
- 03
Quantity by part and variant plus repeat-demand context
- 04
Critical dimensions, interfaces, threads and assembly conditions
- 05
Powder-removal, cleanliness, surface, dye and coating requirements
- 06
Inspection, material records, packaging, labeling and delivery needs
Questions before routing
Questions about this manufacturing route
These answers prepare the request; the reviewed quote controls project-specific commitments.
Does SLS require support structures?
No. The surrounding unsintered powder supports the build, which is why SLS handles undercuts and lattices that would need support elsewhere. The design must still allow powder removal: plan at least two escape holes of 4 to 5 mm per enclosed volume, and account for orientation, heat, feature resolution and post-processing.
How accurate are SLS parts?
Accuracy is commonly quoted as ±0.3 mm or ±0.3% of the nominal length, whichever is larger. Large flat areas and long spans are the usual problem: thermal gradients in the powder bed pull them out of plane, and a part that measures well at 50 mm can drift noticeably at 300 mm. State the fits that matter so nesting, orientation and any machined-after-print feature can be reviewed.
Is an SLS surface smooth enough for a cosmetic product?
As-built SLS carries a uniform matte grain at roughly Ra 8 to 15 µm, which reads as a finished texture on many products but shows powder witness on down-facing surfaces. Media finishing, dyeing or vapour smoothing improve appearance and can round edges by a few tenths of a millimetre. State the required surface, colour reference, protected features and comparison standard in the RFQ.
Can SLS parts be used in production?
Potentially, when the selected material, environment, consistency, documentation, surface and inspection plan suit the application. PA12 publishes near 48 MPa tensile strength with about 15% elongation, which covers many functional housings and brackets, but powder refresh ratio and nesting position affect lot-to-lot consistency. The reviewed quote confirms the supplier route and project-specific controls.
Can sealed internal channels be printed by SLS?
Geometry may be buildable but unusable if powder cannot be removed. A channel below about 3 mm diameter is difficult to clear over any length, and a fully enclosed volume cannot be cleared at all. Provide channel dimensions, openings, cleanliness and flow requirements so escape access and an alternative construction can be reviewed.
Next step
Send the package and get a reviewed quote
Send geometry and process requirements for review. MakeNexa routes capable suppliers from a global network covering competitor-class process categories, then returns a prepared quote or focused clarification for your revision.