Question 1

What is vapor smoothing?

Accepted Answer

Vapor smoothing exposes a 3D printed part to a controlled solvent vapor that briefly softens and flows the outer surface. As the solvent evaporates, the surface re-solidifies smooth and glossy, closing layer lines and sealing surface porosity without removing significant material.

Question 2

Which materials can be vapor smoothed?

Accepted Answer

ABS and ASA from FDM printing, and PA11/PA12 nylon from SLS or MJF, are the common candidates because their chemistry responds to the solvent vapor. PLA and most SLA/DLP resins do not vapor smooth well and usually need a different finishing method.

Question 3

Does vapor smoothing change part dimensions?

Accepted Answer

The change is typically under 0.01 mm since the process flows the existing surface rather than adding a coating layer. Fine features and sharp edges can soften slightly, so call out critical tolerances and detail when you request a quote.

Question 4

Does vapor smoothing make parts watertight?

Accepted Answer

Often, yes. FDM and powder-bed prints have inherent micro-porosity between layers or fused powder grains, and the melted, flowed surface from vapor smoothing typically seals that porosity, which is why it is a common step for fluid- and air-handling parts.

Question 5

Vapor smoothing vs tumbling or bead blasting?

Accepted Answer

Tumbling and bead blasting are mechanical processes that deburr and produce a matte finish but do not seal porosity or add gloss. Vapor smoothing is a chemical process that produces a glossy, sealed, injection-molded-like surface, though it works on a narrower set of materials.

Question 6

Is vapor smoothing good for parts with fine text or embossed logos?

Accepted Answer

Not usually. The vapor flows plastic across the surface, which can blur fine embossed text or soften sharp-edge-critical features. For parts where crisp fine detail matters more than a glossy sealed finish, a lighter mechanical finish is often a better fit.

Design rule	Typical spec	Why
Compatible materials	ABS, ASA, and PA11/PA12 nylon	The solvent vapor has to chemically soften the plastic; PLA and most photopolymer resins are not good candidates.
Surface roughness improvement	roughly Ra 8-12 microns as-printed down to Ra 1-2 microns smoothed	The vapor flows the outermost layer, closing layer lines into a continuous glossy surface.
Dimensional impact	typically under 0.01 mm change	Material flows rather than being added, so most tolerances hold; call out critical fits so the shop can confirm.
Fine detail and sharp edges	not ideal below about 0.5 mm feature size	Sharp edges soften slightly and embossed text or fine lettering can blur or fill in.
Watertightness	often fully sealed against liquids and gases	The melted skin closes the micro-porosity inherent to FDM and powder-bed prints, useful for fluid- and air-handling parts.

Process	Best for	Typical volume	Choose it over Vapor Smoothing when
Media tumbling	Bulk edge-break and light smoothing	Any batch size	You want a lower-cost mechanical process for deburring and light smoothing and can accept a matte, non-glossy result that can round off fine detail.
Bead blasting	Uniform matte finish	Any batch size	You want a consistent matte, low-sheen surface and do not need the part sealed or made glossy.
Hand sanding and priming	Spot cosmetic finishing	Low volume or one-off	You need cosmetic work on a small number of parts and can absorb manual labor instead of a batch chemical process.

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