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Process guide

FDM, SLA or SLS: which 3D printing process fits your part?

FDM is not automatically cheap and SLA is not automatically better. Geometry, surface, tolerance and quantity decide the process.

Processes7 min

Summary

Key points

  • FDM is strong for practical parts and larger shapes.
  • SLA gives fine details and smooth surfaces but has resin handling limits.
  • SLS avoids classic supports and works well for complex nylon parts.
  • Choose process from function, surface and quantity.

Overview

FDM is strong for practical parts and larger shapes.

Translate the requirement into a measurable target before selecting a process or profile.

FDM for practical functional parts

SLA gives fine details and smooth surfaces but has resin handling limits.

Check geometry, material and orientation together instead of optimizing one setting in isolation.

SLA for fine detail

SLS avoids classic supports and works well for complex nylon parts.

Document the practical limit that would make the part unusable in its real environment.

SLS for complex nylon parts

Choose process from function, surface and quantity.

Use a representative test feature when fit, load or surface quality is critical.

Decision matrix

FDM is strong for practical parts and larger shapes.

Record the confirmed model revision and production assumptions for repeat orders.

FAQ

Common questions

Which process is cheapest?

The cheapest process depends on size, geometry and quantity. FDM often wins for single practical parts, while SLS can be efficient for nested batches.

Should I order a test piece?

For tight fits, high load or repeated orders, a small test coupon is usually cheaper than a complete failed part.

Sources

Studies and technical sources