OpenPrintBench

OpenPrintBench is an independent, local-first toolkit for reproducible slicer regression plans and physical-print evidence. It is designed to work with desktop slicers already installed by the user, beginning with Bambu Studio and later OrcaSlicer.

The first development milestone can:

• discover a local Bambu Studio or OrcaSlicer executable;
• report the detected slicer version without using a cloud account;
• fingerprint an STL or 3MF input;
• produce an inspectable, shell-free Bambu Studio slicing command;
• emit a JSON plan that can become part of a reproducible regression report.

OpenPrintBench does not upload models, control printers, use Bambu Cloud, request access tokens, or load proprietary network plugins.

Important

OpenPrintBench is not affiliated with, endorsed by, or sponsored by Bambu Lab or the OrcaSlicer project. Product names are used only to describe interoperability with user-installed software.

Status

Pre-alpha. The current code creates and validates slicing plans; it does not yet execute a slice or claim physical-print validation. See the roadmap, daily progress log, and evidence-gated promotion plan.

Quick start

Requirements:

• Python 3.11 or newer
• uv
• Bambu Studio for the current real-machine probe

uv sync
uv run openprintbench doctor
uv run openprintbench doctor --json

Create a plan for a 3MF that already contains its printer, process, and filament settings:

uv run openprintbench plan \
  --slicer bambu \
  --input path/to/project.3mf \
  --output-dir runs/example \
  --output-name sliced.3mf

For a bare STL, provide full machine, process, and filament settings:

uv run openprintbench plan \
  --slicer bambu \
  --input path/to/model.stl \
  --output-dir runs/example \
  --machine-settings path/to/machine.json \
  --process-settings path/to/process.json \
  --filament-settings path/to/filament.json

The generated command is an argument array. OpenPrintBench does not construct or execute a shell string.

Development

uv sync
uv run ruff check .
uv run ruff format --check .
uv run mypy src
uv run pytest -q --cov=openprintbench --cov-report=term-missing
uv build

Project principles

• Local files stay local by default.
• Every result must identify its input, slicer version, and configuration.
• Planned, executed, and physically validated states are never conflated.
• Claims require machine-readable evidence plus a human-readable explanation.
• Upstream names, trademarks, and licenses remain clearly attributed.

License

OpenPrintBench is available under the MIT License. Interoperated slicers retain their own licenses and are not redistributed by this project.