OrcaSlicer-mcp

MCP server that lets Claude (or any MCP client) slice models with the official, unmodified OrcaSlicer through its command line. No fork and no patched build: just updates OrcaSlicer itself.

Tested with OrcaSlicer 2.4.2 on Windows, driven from WSL2, Elegoo Centauri Carbon profiles.

Tools

overrides are process settings by OrcaSlicer key, e.g. {"sparse_infill_density": "40%"}.

Related MCP server: CAD to Print MCP

How profiles are handled

Bundled profiles inherit from each other. The CLI resolves that for machine files, but not for filament files (they silently slice as PLA with 0 g). So the server flattens the filament and process chains itself and passes the original machine file.

Setup

1. Install OrcaSlicer and uv.

2. Clone this repo.

3. Add to your .mcp.json (Claude Code):

{
  "mcpServers": {
    "orcaslicer": {
      "command": "uv",
      "args": ["run", "--directory", "/path/to/OrcaSlicer-mcp", "orcaslicer-mcp"],
      "env": { "ORCASLICER_PATH": "/mnt/c/Program Files/OrcaSlicer/orca-slicer.exe" }
    }
  }
}

ORCASLICER_PATH is only needed if OrcaSlicer is not on PATH or in its default install location. From WSL, a Windows orca-slicer.exe works; paths are converted with wslpath.

Tests

uv run pytest                                      # unit tests
ORCASLICER_PATH=/path/to/orca-slicer uv run pytest # plus a real slice of a 20 mm cube

License

MIT