Request access to the MARB answer key
This dataset is the answer key (the reference assembled STEP and the placement spec) for MARB task 1, M3-CRETE. It is gated to prevent inadvertent training-data contamination, not for secrecy or security: the data is openly licensed and access is granted for any legitimate use (grading runs, research). Access is logged. The public benchmark input (kits, brief, scoring spec) is in the open dataset and does not require this gate.
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MARB — Mechanical Assembly Readiness Benchmark
Can AI assemble a real machine?
Answer key (gated) — M3-CRETE, task 1
This is the answer key for MARB task 1, the M3-CRETE gantry frame. It holds the reference assembled geometry and the placement spec that the MARB grader scores runs against:
m3_reference_round1.step— the reference assembled STEP (the intended machine).m3_reference_assembly.yaml— the placement spec: per-part intended pose, interface gaps, and orientation labels.
The stock parts the model places (beams, belts, motor, spacers, pinion) are not here. Those are inputs and ship in the open blind kit.
Why this is gated
The gate is about contamination, not secrecy or security. The answer key is openly licensed (see License below) and is not confidential. Gating only keeps it out of the crawlable file tree that feeds model training data, so the benchmark keeps measuring capability rather than memorization. Access is granted for any legitimate use; manual approval is a light check, not a barrier.
MARB grades how well an AI places parts against this reference. If the answer key is freely crawlable, it leaks into model training data and the benchmark stops measuring capability. Gating this dataset keeps a logged, terms-bound channel for legitimate use (grading runs, research) while keeping it out of the open file tree that crawlers and training pipelines ingest.
This is not a guarantee against contamination. Anyone granted access can leak the key. The durable defense is task rotation: new machines are added as held-out tasks whose keys are released only through this gated channel. See the MARB roadmap.
How to use it
- Get access through the request form above.
- Download the reference STEP.
- Install the engine and grade your exported run:
pip install "cadclaw>=0.9.0"
python grader/marb_pose_metric.py --ref m3_reference_round1.step --run your_export.step
python grader/marb_gap_metric.py --ref m3_reference_round1.step --run your_export.step
python grader/marb_orient_metric.py --ref m3_reference_round1.step --run your_export.step
The grader and metrics live in the MARB repository. The public benchmark input (the kits you hand the model) is the open dataset SunnydayTech/marb-m3-crete.
License
The placement spec is MIT. The reference geometry includes OpenBuilds-derived parts under CC BY-SA 4.0 and two Sunnyday-authored parts under MIT. Full notice: kits/LICENSE.md. V-Slot, C-Beam, and V-Wheel are registered trademarks of OpenBuilds LLC.
Contact: info@sunn3d.com
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