5 Expert Finishing Tips for Direct Metal Laser Sintering Parts

Post‑processing a Direct Metal Laser Sintering (DMLS) part is a meticulous task—more involved than SLS, but with the right techniques you can achieve industrial‑grade aesthetics and performance. In this guide, we break down five practical steps that will help you finish your parts to professional standards.

1. Remove Support Structures Cleanly

DMLS requires metal supports, which are harder to remove than polymer ones. During design, minimize overhangs below 45° and position unavoidable supports so they’re accessible for cutting or CNC machining after printing. Clean removal preserves dimensional accuracy and surface finish.

2. Conceal Layer Lines

Layer lines are inherent to powder‑bed processes. Optimizing build orientation can reduce their visibility, but gentle hand sanding or light abrasive finishing is often necessary. Use a fine grit to maintain tolerances while smoothing the surface.

3. Choose the Right Surface‑Smoothing Technique

Media blasting or tumbling delivers a satin finish by removing micro‑scale irregularities. For high‑precision parts, consider advanced methods such as electrical discharge machining (EDM) or liquid honing. Batch processing via tumbling saves time when handling multiple parts.

4. Preserve Mechanical Integrity

Many DMLS powders require heat treatment to unlock their full mechanical properties. Vacuum furnaces or hot isostatic pressing (HIP) can eliminate porosity and homogenize strength. Always reference the material data sheet for pre‑ and post‑treatment specifications.

5. Leverage the Full Spectrum of Coatings

From corrosion‑resistant paints to decorative metal plating (gold, chrome), coatings protect and beautify DMLS parts. Ensure the surface is fully cleaned—removing powder and machining debris—before applying any coating to guarantee adhesion and durability.

While DMLS finishing demands patience and precision, mastering these steps enables you to produce durable, high‑quality parts that meet both aesthetic and functional requirements.