G-code

Provenance: maintained in earthtojake/text-to-cad. Use the installed local skill files as the runtime source of truth; the repository link is only for provenance and release review.

Slice with OrcaSlicer, headless (below) or by opening the model in the OrcaSlicer app for the user. The agent never contacts a printer: for a Bambu Lab printer, hand the result to $bambu-labs; for any other printer, give the user the .gcode.

Install OrcaSlicer

• macOS: brew install --cask orcaslicer. The command line is /Applications/OrcaSlicer.app/Contents/MacOS/OrcaSlicer.
• Windows and Linux: install a release from https://github.com/OrcaSlicer/OrcaSlicer/releases. The command is orca-slicer; on Linux, run it from the AppImage or Flatpak.

Below, <orca> is that command.

Slice headless

OrcaSlicer's command line (https://www.orcaslicer.com/wiki/cli/cli_mode) needs complete presets: it doesn't fill in a preset's parent settings, and it slices only with a process whose compatible printers name the printer. scripts/orca_presets.py (Python 3, no dependencies) writes them from OrcaSlicer's presets, searching the user's own first, then OrcaSlicer's built-in profiles.

1. Find the user's printer, process and filament presets. Prefer the presets the user prints with; never invent one, since a wrong bed size or temperature can damage the printer.

   python scripts/orca_presets.py --list machine --match "MK4S"
   python scripts/orca_presets.py --list process --match "@MK4S 0.4"
   python scripts/orca_presets.py --list filament --match "PLA @MK4S"
   

2. Write the complete presets:

   python scripts/orca_presets.py --printer "Prusa MK4S 0.4 nozzle" \
     --process "0.20mm SPEED @MK4S 0.4" --filament "Prusa Generic PLA @MK4S" \
     --out presets
   

3. Slice. Give --outputdir an absolute path:

   <orca> model.stl \
     --load-settings "presets/process.json;presets/printer.json" \
     --load-filaments presets/filament-1.json \
     --arrange 1 --slice 0 \
     --outputdir /absolute/path/to/out --export-3mf model.gcode.3mf
   

   This writes plate_1.gcode, the plain G-code, and model.gcode.3mf, the sliced 3MF, into that folder. The command line reads .stl, .3mf, .obj and .amf; export STEP to STL or 3MF with $cad first. Override one setting with --<setting>=<value>, using the setting's key with hyphens for underscores, such as --layer-height=0.16.

Open in OrcaSlicer

When the user would rather pick presets and slice themselves, or no preset can be found, open the model in the app: open -a OrcaSlicer model.stl on macOS, Start-Process model.stl on Windows when OrcaSlicer opens that file type, or orca-slicer model.stl on Linux. The app also reads STEP.

Check before printing

• <orca> model.stl --info prints the model's size; it has to fit the bed.

• Check the slice's settings, which OrcaSlicer writes at the end of the G-code:

  grep -E '^; (printer_model|nozzle_diameter|filament_type|nozzle_temperature|hot_plate_temp|bed_temperature) =|printing time' out/plate_1.gcode
  

  Confirm they match the user's printer and material before anyone prints it.

Hand off

• A Bambu Lab printer: $bambu-labs, with the .gcode.3mf.
• Any other printer: the user prints the .gcode from their printer's app, its web interface (PrusaLink, OctoPrint, Mainsail, Fluidd) or an SD card.