Show HN: Open-source tool lets GPT and Claude generate real LEGO CAD models via LDraw
antelocnova · hn · 2026-10-03
A developer shared an open-source project that makes LLMs generate actual LEGO CAD models.
- Core idea: LDraw is a low-level 'assembly-style' language describing how LEGO bricks fit together; one .mpd/.ldr file equals one LEGO CAD model renderable in LDView, LeoCAD, or Studio.
- How it works: After months of iteration, the author used GPT-6 Astra and Opus 5.5 to build a Python toolset, instructions, and docs that let agents generate high-quality LDraw models.
- Release: Packaged as a Dockerized web app with selectable providers (OpenAI, Claude, OpenRouter).
The project is open source and the author is seeking feedback.
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