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Raw print, or finished part.
Your call.

SLS and MJF nylon comes off the machine matte and slightly porous. Finishing is the second step that turns that raw print into a sealed, coloured, or hardware-ready part — vapor smoothing, dyeing, sanding, and threaded inserts, applied to what our SLS and MJF lines already produce.

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Vapor smoothing Dyeing Sanding Threaded inserts

Vapor smoothing

A sealed, injection-moulding-like surface — on a printed part.

SLS and MJF nylon parts come off the machine with a visibly grainy, slightly porous surface — a side effect of building from fused powder. Vapor smoothing exposes the part to a chemical vapor that briefly melts the outermost layer of material, which then re-solidifies into a smooth, continuous skin.

What changes

Surface texture

The grainy, powder-built texture is replaced by a smooth, closed surface — visually closer to an injection-moulded part than a printed one.

Why it matters

Sealed & cosmetic

Useful when a part needs to look presentable straight away, or where a closed surface reduces the porosity that raw SLS/MJF parts otherwise have — for example where a part will hold a fluid or needs to resist surface contamination.

Applied to

SLS & MJF nylon

A finishing step on top of our own SLS and MJF lines — not a standalone print process.

We don't publish specific before/after roughness numbers or a guaranteed finish grade here — ask our engineers what vapor smoothing will realistically do for your specific part and material at quote.

Vapor-smoothing partner: Matrix3D^CONFIRM — 杭州矩阵智能制造, one of the brands Primofort works with for this process.

Dyeing

Solid colour, through the part.

Raw SLS and MJF nylon prints in natural grey or off-white. Dyeing takes that raw part and immerses it in a coloured dye bath, so the part comes out a uniform solid colour rather than staying grey or needing a painted coat.

What it's for

Uniform colour

A quick way to move a part off natural grey to a solid colour, without the cost or fragility of a painted finish.

Not this

Not full colour

Dyeing gives one solid colour per part. For gradients, multi-colour detail, or printed graphics in a single build, that's PolyJet, not dyeing.

Sanding

Manual finishing where it's needed most.

Hand or machine sanding smooths specific surfaces or edges on a part — useful for a part that needs one particular face refined without vapor-smoothing the whole model, or for cleaning up support-contact points and parting lines.

Threaded inserts

Real metal threads in a printed part.

Printed nylon threads wear out fast under repeated fastening. Heat-set or press-fit threaded metal inserts give a printed part a real, durable threaded connection for screws and fasteners — common on enclosures, brackets, and any part that gets assembled and disassembled more than once.

Proof, not promises

Finishing happens on our own floor.

These photographs were taken on our production floor in Dongguan, the same floor that runs our SLS, MJF, and PolyJet lines. As noted above, we do not yet have a genuine before/after vapor-smoothing photograph to show — sample photography is being arranged rather than substituted.

Primofort production floor — Dongguan

Climate monitoring on the production floor

28.0 °C · 40.2 %RH — monitored floor climate

Primofort · 元城科技 — Room 303, Building 3, Huakecheng, Guanchang Rd, Dongcheng, Dongguan, Guangdong 523128, China

Get a quote

An engineer replies within 24 hours.

Real engineer, real quote. Not an auto-mailer — a person who has read your requirements and looked at your part.
Your IP stays yours. We send a secure link for CAD files; nothing is shared outside the project team. NDA on request.
We'll tell you what finishing actually does for your part. If vapor smoothing, dyeing, sanding, or inserts don't suit your application, we'd rather say so at quote than after you've paid.

Prefer direct? service@primofort.com · +86 158 9991 6661 (WhatsApp)

Raw print, or finished part.Your call.