Nylon PA12 (SLS): 3D Printing for Functional Parts

Nylon PA12 is the material most engineering teams mean when they say "printed nylon": a tough, low-moisture-absorbing polyamide that behaves like the production polymer it is. At Arterki, nylon PA12 parts come off industrial SLS platforms — the powder-bed process that builds strong, isotropic-feeling parts with no dedicated support structures to remove — and every shipment ships with an inspection report.

Quick answer: We print PA12 nylon on industrial SLS (a Farsoon HT252P-class platform plus desktop units) to the ±0.3 mm tolerance class typical of the process, confirmed per feature at quotation. An engineer reviews your geometry before the build starts, quotes come back within 24 hours, and the inspection report travels with the parts.

PA12 at Arterki: Printed in-house on industrial SLS — Farsoon HT252P-class platform plus desktop units. PA12 is the standard material; PA11 and SLS-grade TPU are quotable. Typical SLS tolerance class ±0.3 mm, confirmed per feature at quotation. Engineer DFM review before every build. Inspection report with every shipment.

SLS PA12 capability at Arterki

Geometry and build orientation decide most SLS outcomes, so we review both before the quote is finalized. The values below are the ones we commit to in writing; anything your drawing adds on top comes back addressed in the quote itself.

The two lines that decide most orders: tolerance and material. SLS nylon parts come off the bed inside the ±0.3 mm class that the process is known for; if your drawing calls out tighter limits on specific features, we confirm what the process can hold on your geometry at quotation, and the inspection report measures against what we agreed. On material, PA12 covers most functional needs; when a program needs the lower moisture uptake of PA11 or the compliance of SLS-grade TPU, both are on our quotable list.

For the service behind the machines — quoting, build planning, post-processing — see our 3D printing services page.

When SLS nylon PA12 is the right call

SLS earns its place when the geometry or the batch size works against every other process.

Complex internal geometry. Channels, ducts, snap features and consolidated assemblies print as-is, because the powder bed carries the part during the build. A vent manifold that would be three machined parts and a gasket can print as one PA12 body.

Batch runs of small functional parts. SLS nests parts through the full build volume, so fifty clips cost far less per part than five — the opposite of machining economics. Validation sets and sparsely-ordered spares suit it.

Parts that need to behave like a production polymer. PA12 is tough, fatigue-tolerant and dimensionally steadier in humidity than many nylons, which is why clip features and snap fits designed for molding often test believably in SLS PA12.

Living-hinge-class features and snap fits. Printed PA12 flexes enough for development testing of clip and latch mechanisms before you cut a mold.

Reach for machined nylon instead when a part needs a specific stock grade's full bulk properties or a fine surface on a few faces — PA6 is on our CNC machining material list. Reach for molded parts once the design converges; more on that below.

Design notes for SLS PA12

SLS is forgiving, but a few habits in your CAD remove a round of DFM email:

Powder evacuation. Enclosed volumes need escape holes of sensible size so powder can be removed after the build. Mark them on the drawing or place them where a drilled hole is acceptable.

Wall thickness. Very thin walls and lone thin ribs are the features most likely to come off the bed fragile or warped. If a wall must be thin, mark it non-critical and we will confirm what holds on your geometry at quotation.

Large flat areas. Big flat faces tend to curl and show scorch marking. A rib, a curve or a vent pattern usually solves it for free.

Feature-level tolerances. Put tight limits only on the features that functionally need them and mark them on the drawing — the inspection report measures what you mark critical.

Cosmetic faces. SLS surfaces have a fine, matte, slightly granular texture as-printed. Bead blasting, which we run in-house, evens it further. If a face is customer-facing, mark it so orientation and finishing get planned around it.

None of these are absolutes — they are the notes our engineers send back most often on first-time SLS drawings. Send the CAD and we will mark the rest.

PA12 compared with alternatives

Datasheet numbers for PA12 vary widely by grade and test direction, so treat any figure you carry into a spec as grade-specific. If you are weighing nylon against ABS for a functional part, our ABS material page covers the machined-and-printed ABS routes in detail.

Beyond prototypes: molded PA in validation batches

When the printed design has converged and the program needs real molded parts — 50 to 2,000 of them — our rapid-tooling injection molding service is the next step. Nylon grades are confirmed at quotation: send the grade name with your drawing and the quote comes back with the material decision in writing before tooling starts.

Questions engineers ask

Do you print MJF or SLS for PA12?

Our nylon parts are printed on SLS platforms — an industrial Farsoon HT252P-class machine plus desktop units. If your test plan was written around MJF, send it with the drawing: we will confirm the SLS PA12 route for your geometry and measurement plan at quotation, with the same inspection trail on the parts that ship.

What tolerance do SLS nylon parts hold?

SLS PA12 parts come off the bed inside the ±0.3 mm class typical of the process. Feature-level capability depends on geometry and orientation, so we confirm the achievable limits on your part at quotation — and the inspection report records a measured value for every dimension you mark critical.

PA12 or PA11 — which should I order?

PA12 is the default: tough, stable, and the most economical powder. PA11 gives you slightly better elongation and lower moisture uptake, which matters for snap features and parts living in humid environments. Both are on our quotable SLS list — describe the environment in your RFQ and the quote comes back with a recommendation.

How strong are SLS PA12 parts compared with molding?

Printed PA12 behaves like a usable engineering polymer, and printed versus molded PA12 differ in ways that depend on grade and build direction. For test articles that will feed a design decision, tell us what the test measures — load, deflection, cycles — and we will tell you at quotation what the printed part can and cannot represent.

Can SLS PA12 parts be colored?

As-printed PA12 is white to off-white; bead blasting, which we run in-house, evens the texture. Dyeing and other finishes are confirmed at quotation — name the requirement in your RFQ and the quote states what we can support.

What batch sizes make sense for SLS?

SLS nests parts through the build volume, so batches of tens to hundreds of small parts are where the process shines economically. Single large parts print fine too; batch pricing improves with nesting, and the quote reflects it.

What's in your inspection report: measured values for the dimensions you marked critical on the finished nylon part, recorded against the tolerance class in your quote, plus visual condition — so the data behind your test report traces to the exact parts it came from.