Selective Laser Melting (SLM) is an additive metals manufacturing technology with a growing presence in the healthcare, aerospace and high technology engineering and electronics sectors.
The process works by using a laser to melt fine layers of gas atomised metallic powders together directly from a CAD model building up the part one layer at a time, similar to that of SLA. The powder is applied in very thin layers between 20 to 100 microns so the parts can have excellent detail, strength and finish.
The downside is minor pitting on verticle surfaces.
The type of printing is a form of fused deposition. See one in action in this video:
One of the more controvertial uses for this technology is the unregulated fabrication of amunition and arms.
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