Every 3D printing technology produces a different surface texture. Understanding what to expect helps you choose the right technology and set appropriate expectations.
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.
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.
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: 1700 x 800 x 600mm (≈66.9 x 31.5 x 23.6 in)
Min wall: 1.0mm
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.
FGF (fused granulate fabrication)
Best for: Very large parts, furniture, fixtures, architectural elements, industrial tooling
Uses plastic pellets instead of filament
Max build: 2400 x 2400 x 1000mm (≈94.5 x 94.5 x 39.4 in)
Min wall: 2mm
Visible layer lines (larger nozzle for speed)
Best for parts where size matters more than fine detail
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.
Makelab is a professional 3D printing service in Brooklyn, NYC. Our engineers review every file for printability and can help optimize your design. Get an instant quote.
Learn more on our website:
Full Design Guidelines — comprehensive rules by technology
File Requirements — formats, mesh settings, export tips
Browse Materials — find the right material for your application
How smooth are Makelab’s finishes?
Surface quality depends on the process selected, and Makelab offers finishing options to match different needs.
SLA resin provides the smoothest finish right out of the printer, making it ideal for models where surface quality is critical. MJF nylon delivers strong, functional parts but has a naturally textured surface that can be refined with polishing or coating. FDM creates larger drafts quickly but with visible layer lines. Our finishing services help teams strike the right balance between functional testing and presentation-ready aesthetics.
👉 To request additional finishing beyond standard output, submit an intake form and include details about your application.