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FDM vs SLA 3D Printing

Two completely different technologies, both called "3D printing." Which is right for your project depends on whether you need strength and engineering materials — or ultra-fine surface detail.

Quick Answer

Choose FDM when you need:

  • ✓ Functional, load-bearing parts
  • ✓ Engineering materials (Nylon, ABS, ASA, TPU)
  • ✓ Large parts (up to 340×320×340mm)
  • ✓ Outdoor or UV-exposed parts
  • ✓ Lowest cost per part, no post-processing

Choose SLA when you need:

  • ✓ Ultra-fine surface detail (0.025mm layers)
  • ✓ Near-smooth finish without sanding
  • ✓ Jewelry, dental, or intricate miniatures
  • ✗ Not for functional or impact-loaded parts
  • ✗ Requires wash + cure post-processing

How Each Technology Works

FDM — Fused Deposition Modeling

A heated nozzle melts thermoplastic filament and deposits it layer by layer onto a build plate. Each layer bonds to the one below as it cools. The result is a solid thermoplastic part with visible layer lines (0.1–0.3mm). Get3DPrints.com uses Bambu Lab P2S printers capable of 0.16mm layers on the Premium finish setting.

SLA — Stereolithography

A UV laser selectively cures liquid photopolymer resin layer by layer. Parts are built upside-down, pulled upward from the resin vat. Layers can be as fine as 0.025mm, producing extremely smooth surfaces. After printing, parts must be washed in isopropyl alcohol and post-cured under UV light before use.

Full Comparison

FactorFDM (Get3DPrints.com)SLA / Resin
Cost per partLow — $0.02–$0.20/gram materialModerate — resin $0.10–$0.50/mL
Surface finishVisible layer lines (0.1–0.3mm)Near-smooth — layers as fine as 0.025mm
Detail resolutionGood — 0.4mm nozzle limits fine featuresExcellent — fine details, sharp edges
Material optionsWide — PLA, PETG, ABS, ASA, TPU, NylonLimited — standard, ABS-like, flexible, castable resins
Part strengthHigh — thermoplastic, engineering-grade optionsModerate — resin is brittle, can crack under impact
Build volumeLarge — up to 340×320×340mm at Get3DPrintsSmaller — typical 145×145×175mm on prosumer machines
Post-processingMinimal — remove supports, doneRequired — IPA wash, UV cure, support removal (messy)
UV resistanceExcellent with ASA materialPoor — standard resins yellow and degrade in sunlight
Lead timeFast — most parts within 1–3 daysSimilar, but post-processing adds 1–2 hours per batch

Where Each Technology Wins

FDM: Functional Parts, Engineering Materials, Large Builds

FDM is the dominant technology for any part that needs to do something. The material library is unmatched: PLA for prototypes, PETG for water-resistant functional parts, ABS and ASA for heat resistance, TPU for flexible applications, and Nylon for engineering-grade strength. SLA resins cannot replicate these properties.

FDM also wins on build volume. Our Bambu Lab P1S printers handle parts up to 340×320×340mm — far larger than typical SLA machines. FDM parts can be drilled, tapped, sanded, painted, and bonded with standard adhesives.

The visible layer lines of FDM are often overstated as a drawback. With our Premium finish (0.16mm layers), surface quality is excellent for most applications. Light sanding or priming eliminates layer lines entirely for display-quality results.

SLA: Fine Detail, Display Models, Dental and Jewelry

SLA wins when surface finish and fine feature resolution are the primary requirements. Layers as fine as 0.025mm are essentially invisible. Intricate details — lettering, fine textures, jewelry filigree, dental anatomy — are reproducible in ways FDM cannot match.

However, SLA parts are brittle. Standard photopolymer resins have low impact resistance and will crack under loads that FDM handles easily. They also degrade in UV light — outdoor SLA parts yellow and become brittle within weeks. SLA is a display and prototype technology, not an engineering one.

We offer FDM only. If your project specifically requires SLA — dental models, fine jewelry prototypes, ultra-detailed miniatures — we are not the right service for that application.

Common Questions

What is the difference between FDM and SLA 3D printing?

FDM melts thermoplastic filament layer by layer — affordable, strong, wide material options. SLA cures liquid resin with UV light — finer detail and smoother surfaces, but brittle parts and messy post-processing. FDM is better for functional parts; SLA for fine-detail display models.

Is FDM or SLA stronger?

FDM is generally stronger. Materials like Nylon, ABS, and PETG have high tensile strength and toughness. SLA resin is stiffer but brittle — it cracks under impact. For engineering parts, FDM is the correct choice.

Which is cheaper, FDM or SLA?

FDM is typically cheaper per part. Material costs range from $0.02/gram (PLA) to $0.20/gram (Nylon) at Get3DPrints.com. SLA resin costs more and requires additional consumables (IPA, UV lamp).

When should I use SLA instead of FDM?

Choose SLA when surface finish and fine detail are the primary requirements — jewelry prototypes, dental models, intricate miniatures. For functional, strong, or outdoor parts, FDM is the better choice.

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