Surface finishes
Vapor smoothing services
Vapour smoothing is available for 3D printed parts. A printed surface is built in layers and holds that texture; exposing it to solvent vapour reflows the outer skin so those layers close up. What comes back is smoother, glossier and much easier to wipe clean.
Types of vapor smoothing
| Process | Surface Preparation | Color | Applicable materials | Cosmetic availability | Visual appearance |
|---|---|---|---|---|---|
| MJF | As printed | Grey (default), Dyed Black | HP PA 12 | No | Smooth glossy appearance |
| SLS | As printed | White (default), Dyed Black | PA 12 | No | Smooth glossy appearance |
Example of an MJF vapor smoothed dyed black part
Design considerations for vapor smoothing
Appearance and liquid resistance are two different specifications here. Say up front if the part has to hold liquid — it changes how long the part is held in vapour, and it cannot be added afterwards.
Consider how the parts will hang on racks during the process, as hanging marks might be visible on the final result.
Geometry decides whether a part is a candidate. Sharp corners soften, fine detail rounds off, and a thin wall can distort while the skin is fluid — so send the geometry with the enquiry and an engineer will say whether it will survive the process
What is vapor smoothing?
Only the outermost skin reflows — the part's core is untouched, so it keeps its strength and its dimensions to within the tolerance of the print. Sealing the surface also closes the porosity between layers, which is what reduces moisture pickup.
Surface tension does the work: once the skin is briefly fluid it pulls itself flat, filling the step between one printed layer and the next. Nothing is added and nothing is abraded away.
Metal Market offers vapor smoothing for 3D printed parts to improve their cosmetic and functional performance. To find out more, contact sales@metal-market.in
The vapor smoothing process
After 3D printing, the part is cleaned and prepared for vapor smoothing by removing any debris.
The part is then sealed in a container with a small amount of solvent, such as acetone or MEK (methyl ethyl ketone).
The vapor condenses onto the surface of the part, melting and fusing the outer layer of the printed object.
After the desired finish is achieved, the part is removed from the container and allowed to cool and dry.
