hackerscad lets you create parametric CAD models by writing code, with a 3D view that updates as you work. You can also edit shapes in the view and have the corresponding code generated.
It is for people designing printable parts and working with AI agents. Its MCP server can read the agent-focused documentation, check and render models, and show them in the app. - Uses a language with units, selectors and libraries - Supports fillets, holes and sketches - Exports files for 3D printers