scadcoder-qwen3.5-9b-v4

A 3-epoch LoRA fine-tune of Qwen3.5-9B for parametric bio-lab OpenSCAD, for the Tiiny Pocket Lab (v4: v2's data plus rejection-sampled and held-out distilled 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

9,136 single-turn rows (8,187 unique), 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);
  • 269 of v2's own rejection-sampled generations that passed the verifier, weighted x2;
  • 680 examples distilled from Claude Opus on bench-style descriptions of 17 part families that are not Prompt-to-Bench tasks (every description shares at most 36% of its tokens with any benchmark prompt), each render-verified (watertight, bounding box within 15%), weighted x2.

Unlike v3, nothing in the training data paraphrases a benchmark task, so its benchmark scores measure transfer. Details: https://github.com/ATinyGreenCell/prompt-to-bench (§6.4).

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