scadcoder-qwen3.5-9b-v3

A 3-epoch LoRA fine-tune of Qwen3.5-9B for parametric bio-lab OpenSCAD, for the Tiiny Pocket Lab (v3: v2's data plus Opus-distilled and rejection-sampled examples).

  • Base: Qwen/Qwen3.5-9B (arch Qwen3_5ForConditionalGeneration); vision encoder preserved, language layers LoRA-merged to bf16 safetensors.
  • Run with reasoning/thinking off.

Training data

8,784 single-turn examples, 3 epochs, LoRA rank 32 (dropout 0.1) on the language layers:

  • the 7,238 render-verified examples of v2 (scadcoder-qwen3.5-9b-3ep): 34 parametric part families plus repair examples;
  • 336 examples distilled from Claude Opus on bench-style part descriptions, each render-verified (watertight, bounding box within 15% of the specification), weighted ×3;
  • 269 of the model's own rejection-sampled generations that passed the verifier, weighted ×2.

Evaluation caveat. Several of the distilled part families follow the wording of Prompt-to-Bench task prompts (e.g. tube racks, funnels, gel combs, adapter sleeves) with different dimensions, so this model's scores on those tasks are in-family, not held-out transfer. v2 is the held-out baseline. Details: https://github.com/ATinyGreenCell/prompt-to-bench (§6.4).

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