Indeed, the toxicity of the metal powders is one of the major issues with laser sintering metal, and real care must be taken not to ingest it. The reason we can

Indeed, the toxicity of the metal powders is one of the major issues with laser sintering metal, and real care must be taken not to ingest it. The reason we can deal with it on earth is that the metal falls down very quickly, not lingering in the air to be breathed in. Cleaning laser sintering machines typically requires protective gear, though.