Surface Finish Expectations by 3D Printing Technology

Every 3D printing technology produces a different surface texture. Understanding what to expect helps you choose the right technology and set appropriate expectations.

1. FDM (Fused Deposition Modeling)

What to expect: Visible layer lines on all surfaces. Stepping effect on curved and angled surfaces.

• Layer height: 0.2–0.3mm typically

• Top surfaces: Smoothest

• Side surfaces: Layer lines visible

• Bottom surfaces: Slight texture from bed or support contact

• Supported surfaces: Roughest, support marks visible

Improving FDM finish: Sanding (220→400→600 grit), filler primer, vapor smoothing (ABS only), painting.

2. SLA (Stereolithography)

What to expect: Smooth, near-injection-mold quality. Very fine layer lines, often invisible to the naked eye.

• Layer height: 0.025–0.1mm

• All surfaces: Smooth with slight directional texture

• Support contact points: Small nubs that can be sanded

• Best technology for visual prototypes and presentation models

Note: SLA parts may have a slight yellow tint and become more brittle over time with UV exposure.

3. Industrial SLA

Best for: Large-format high-detail parts, tooling, molds, architectural models

• Same smooth finish as standard SLA at much larger scale

• Materials: Standard Resin, Draft Resin

• Max build: 1000 x 1000 x 600mm

• Min wall: 0.8mm

4. MJF (Multi Jet Fusion)

What to expect: Fine-grained, matte texture with consistent finish on all surfaces. No visible layer lines.

• Uniform texture on all surfaces

• No support marks (powder-supported)

• Consistent mechanical properties in all directions

• Natural color: gray/dark gray

• Slightly porous surface

Improving MJF finish: Dyeing (black most common), media tumbling for smoother feel, painting.

5. FGF (Fused Granulate Fabrication)

Best for: Very large parts, furniture, fixtures, architectural elements, industrial tooling

• Uses plastic pellets instead of filament

• Max build: 1800 x 1200 x 1100mm

• Min wall: 3mm

• Visible layer lines (larger nozzle for speed)

• Best for parts where size matters more than fine detail

6. Quick Reference

• Smoothest: SLA > MJF > FDM

• Most consistent: MJF (no support marks anywhere)

• Best for painting: FDM (after sanding) or SLA

• Most durable finish: MJF dyeing (color won’t chip or peel)

Want a specific finish? Specify in your order notes or discuss with our team.