A 3D printed part straight off the machine often shows layer lines, support marks or a grainy powder texture. The right finish can turn it into a part that looks and feels moulded. This guide explains the most common surface finishes, what each one does and when it is worth paying for.
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Finishes at a glance
| Finish | Works on | Result | Best for |
|---|---|---|---|
| Standard (as printed) | All | Visible layers or texture | Prototypes, internal parts |
| Support removal + light sanding | FDM, SLA | Clean, small marks remain | Functional parts |
| Full sanding | FDM, SLA | Smooth, matte | Show models, painting prep |
| Bead blasting | SLS, MJF, SLA | Even satin texture | Professional matte look |
| Dyeing | SLS, MJF (nylon) | Uniform colour, usually black | End-use parts |
| Vapour smoothing | ABS, SLS/MJF nylon | Sealed, smooth, semi-gloss | Consumer products, easy cleaning |
| Primer and paint | All | Any colour, glossy or matte | Display models, branding |
| Clear coat / polishing | SLA clear resin | Transparent | Light pipes, fluid visualisation |
Sanding
Sanding removes layer lines and support marks by hand. It works on FDM and SLA parts and gives a smooth, matte surface ready for paint. It takes time, so it costs more, and very small details can be softened. Ask for sanding on visible faces only to keep cost down.
Bead blasting
Fine media is blasted at the part to create an even, satin texture. It removes leftover powder from SLS and MJF parts and hides minor marks. It is a low-cost way to make parts look professional.
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Dyeing
Nylon parts from SLS and MJF absorb dye, so the colour goes into the surface rather than sitting on top. It does not chip like paint. Black is the most common choice and hides wear and fingerprints well.
Vapour smoothing
The part is exposed to a controlled vapour that slightly melts the outer surface, closing pores and smoothing texture. Parts become easier to clean, more resistant to staining and more water resistant. Very fine edges can round off a little, so check critical features.
Priming and painting
For a specific brand colour or a high-gloss look, parts are filled, primed and painted, much like a car body. This gives the best appearance but is the most labour-intensive option and adds thickness, which matters for tight fits.
How finishing affects fit and cost
- Sanding and blasting remove a little material; paint adds some. Keep critical fits unpainted or mask them.
- Manual finishes such as sanding and painting add the most cost and lead time.
- Choose finishes per surface: a cosmetic outside and a standard inside often gives the best value.
Read more about accuracy in our 3D printing tolerances guide.
Frequently asked questions
How do I remove layer lines?
Sanding and priming is the most common method for FDM. For ABS and nylon parts, vapour smoothing is faster and more even. Printing in SLA gives much smaller layer lines to start with.
Which finish looks most like injection moulding?
Vapour-smoothed nylon or ABS, or a sanded, primed and painted part, come closest to a moulded look.
Does finishing make parts stronger?
Not usually. Vapour smoothing can slightly improve toughness by closing surface pores, but finishes are mainly for looks, feel and cleanability.
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