LLMs prompted to design 3D-printed bridges: winner held over 100 lbs
Balance- · reddit · 2026-09-28
Someone gave different LLMs fixed constraints (2-foot span, under 500g filament, 18-hour print limit) to generate CAD code for a bridge, then printed the designs and load-tested them to failure.
- Results varied wildly: some models couldn't produce parts that fit together, while the winner held over 100 lbs
- The test uniquely combines physical intuition, spatial reasoning, and functional code generation — something most benchmarks miss
- The poster calls for a standardized 3D-print engineering benchmark and leaderboard
This generate-print-break loop is a far more honest measure of engineering ability than paper benchmarks.
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