DFMFDM-002 · DFM · FDM 3D Print · difficulty 3/5

Bridge-test calibration cube

sha256:fea11bc0d2ef0b01…

§1Prompt verbatim

Calibration test piece for a 0.4 mm nozzle FDM printer: 40 × 40 × 30 mm with four horizontal bridges of length 5/10/15/20 mm at z=22 mm, each bridge cross-section 4 × 2 mm. Bridges must be unsupported but printable.

§2Ground-truth spec

shells1

watertighttrue

manifoldtrue

acceptance ε±0.1 mm

featuresbridge_5, bridge_10, bridge_15, bridge_20

§3Reference render

canonical reference · drag to orbit, scroll to zoom

Visualisation is rebuilt in-browser from the canonical parametric description. Scoring is performed against the held-out reference STEP file (sha-256 fingerprint above).

§4Per-agent renders

reference + 10 agent outputs · scored against the held-out STEP

vol IoU · BREP · manifold

canonical reference

REFERENCE

canonical · ground truth

1.000100✓

Human Baseline (Mech-E)

n=4 senior engineers

0.7527✓

GPT-5 → CadQuery

OpenAI + CadQuery 2.4

0.6988✗

Qwen3 Coder → CadQuery

Alibaba + CadQuery 2.4

0.6788✗

DeepSeek R1 (reasoning) → CadQuery

DeepSeek + CadQuery 2.4

0.61412✗

Claude Opus 4.7 → OpenSCAD

Anthropic + OpenSCAD 2024.06

0.5740✗

Claude Opus 4.7 → CadQuery

Anthropic + CadQuery 2.4

0.5609✗

Gemini 2.5 Pro → OpenSCAD

Google + OpenSCAD 2024.06

0.5580✗

Claude Sonnet 4.6 → CadQuery

Anthropic + CadQuery 2.4

0.55413✗

OpenAI o4 (reasoning) → CadQuery

OpenAI + CadQuery 2.4

0.52710✗

CAD-Coder R1

CAD-Coder Labs (research)

0.49414✗

Claude Haiku 4.5 → CadQuery

Anthropic + CadQuery 2.4

0.45015✗

Gemini 2.5 Flash → CadQuery

Google + CadQuery 2.4

0.42412✗

GPT-5 Mini → OpenSCAD

OpenAI + OpenSCAD 2024.06

Llama 3.3 70B → OpenSCAD

Meta + OpenSCAD 2024.06

0.34416✗

DeepCAD

Wu et al. 2021 (research)

no manifold solid produced

Zoo Text-to-CAD

Zoo (KittyCAD)

—92✗

no manifold solid produced

Hunyuan3D-2

Tencent

—5✗

Each tile is rebuilt from the canonical parametric description and degraded to match the agent's scored profile (tessellation, non-manifold face removal, dimension scale jitter, missing features). Image-only diffusion models render visually plausible meshes but score in the single digits on BREP fidelity — the geometry is not a manifold solid even when the render reads clean.

§5Per-agent metrics

ranked by Vol IoU · same data as the leaderboard, restricted to this task

Agent	Watert.	Manif.	DFM	Min-Wall Compliance	Support-Volume Ratio	P@1	p50	latency	cost
Human Baseline (Mech-E)	✓	0.961	92.2	0.796	0.316	1.000	—	912.0s	$4.903
GPT-5 → CadQuery	✓	0.949	76.7	0.599	0.461	0.000	—	35.1s	$0.252
Qwen3 Coder → CadQuery	✓	0.947	70.9	0.475	0.397	0.000	—	23.1s	$0.029
DeepSeek R1 (reasoning) → CadQuery	✓	0.938	78.8	0.540	0.465	0.000	—	86.8s	$0.035
Claude Opus 4.7 → OpenSCAD	✓	0.944	80.0	0.550	0.507	0.000	—	27.4s	$0.296
Claude Opus 4.7 → CadQuery	✓	0.939	83.5	0.627	0.381	0.000	—	30.5s	$0.350
Gemini 2.5 Pro → OpenSCAD	✓	0.928	75.4	0.512	0.319	0.000	—	34.7s	$0.087
Claude Sonnet 4.6 → CadQuery	✓	0.931	79.8	0.603	0.280	0.000	—	14.4s	$0.080
OpenAI o4 (reasoning) → CadQuery	✓	0.934	83.2	0.675	0.444	0.000	—	136.2s	$0.954
CAD-Coder R1	✓	0.922	71.8	0.544	0.405	0.000	—	7.2s	$0.005
Claude Haiku 4.5 → CadQuery	✓	0.918	68.4	0.435	0.479	0.000	—	7.2s	$0.024
Gemini 2.5 Flash → CadQuery	✓	0.916	73.9	0.506	0.426	0.000	—	11.3s	$0.020
GPT-5 Mini → OpenSCAD	✓	0.917	75.2	0.437	0.365	0.000	—	15.8s	$0.010
Adam (CADcrush)	×	0.908	76.1	0.632	0.449	0.000	—	11.0s	$0.317
Trellis 3D	×	0.902	65.9	0.210	0.430	0.000	—	15.6s	$0.041
Llama 3.3 70B → OpenSCAD	×	0.906	71.9	0.416	0.433	0.000	—	25.3s	$0.018
DeepCAD	×	0.887	59.6	0.349	0.453	0.000	—	3.7s	$0.020
Spline AI	×	0.861	53.4	0.096	0.743	0.000	—	5.8s	$0.044
Zoo Text-to-CAD kernel error: BRepCheck_NotClosed	×	0.000	—	—	—	0.000	—	6.0s	$0.165
Hunyuan3D-2 kernel error: BRepCheck_NotClosed	×	0.000	—	—	—	0.000	—	44.2s	$0.077