Shapeways

On-demand manufacturing in materials you can't print at home — nylon, metal, ceramic. Good for production-quality parts when your desktop machine hits its limits.

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Browser-based parametric CAD that punches above its weight. Free for hobbyists, version-controlled by default, and far more accessible than SolidWorks for getting started.

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McMaster-Carr

Every hardware engineer's open secret — the catalog has STEP models for most parts, so you can drop a real McMaster bolt into your assembly and order it the same day.

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