FDM vs SLS vs Resin: Which 3D Printing Technology Is Right for You?
Updated February 2026 · 10 min read
There are dozens of 3D printing technologies, but three dominate the service bureau market: FDM (fused deposition modeling), SLS (selective laser sintering), and resin (SLA/DLP). Each has clear strengths and trade-offs. Here's when to use each.
FDM — Fused Deposition Modeling
FDM melts thermoplastic filament and deposits it layer by layer. It's the most widely available and cheapest technology. Every local print shop has FDM printers.
Strengths
- • Cheapest per part
- • Wide material selection (PLA, PETG, ASA, Nylon, TPU, PC)
- • Large build volumes available
- • Fast turnaround (often same-day)
Limitations
- • Visible layer lines
- • Weaker between layers (anisotropic)
- • Support material leaves marks
- • Limited detail resolution (~0.2mm)
Best for: Functional prototypes, jigs and fixtures, large parts, anything where cost matters more than surface finish.
SLS — Selective Laser Sintering
SLS uses a laser to sinter powdered material (usually Nylon PA12) into solid parts. No support structures needed — the surrounding powder supports the part during printing.
Strengths
- • No support structures (complex geometries)
- • Isotropic strength (equally strong in all directions)
- • Nylon PA12 is production-grade
- • Great for batch production
Limitations
- • Grainy surface texture
- • Limited material options (mostly nylons)
- • More expensive than FDM
- • Longer lead times (3–7 days typical)
Best for: End-use parts, complex geometry, moving assemblies, medical devices, automotive components, production batches of 10–500 parts.
Resin — SLA / DLP
Resin printing uses UV light to cure liquid photopolymer layer by layer. SLA uses a laser; DLP uses a projected image. Both produce extremely high-detail parts.
Strengths
- • Highest detail and smoothest finish
- • Resolution down to 25 microns
- • Great for jewelry, dental, miniatures
- • Wide resin options (tough, flexible, castable)
Limitations
- • Brittle (standard resins)
- • Small build volumes
- • UV-sensitive (yellows over time)
- • Post-processing required (wash + cure)
Best for: Visual prototypes, jewelry casting patterns, dental models, tabletop miniatures, anything where surface detail is critical.
Quick Comparison
| FDM | SLS | Resin | |
|---|---|---|---|
| Cost per part | $ | $$ | $$ |
| Surface finish | Fair | Good | Excellent |
| Strength | Good* | Excellent | Fair |
| Detail | ~0.2mm | ~0.1mm | ~0.025mm |
| Turnaround | 1–3 days | 3–7 days | 2–5 days |
| Best for | Prototypes, fixtures | Production parts | Visual models |
* FDM strength varies by orientation — weaker between layers.
Find a 3D Printing Shop Near You
Ready to get a quote? Browse our directory of local 3D printing services and filter by material to find shops that run the technology you need. Most shops list their printer types and materials, so you can match technology to your project requirements.
Popular local 3D printing services:
find3dprinting.com Editorial Team
We've reviewed 500+ 3D printing services across the US to help you find the right shop for your project.