Build a robot arm CAD package from a single request

A text-to-CAD setup turned one prompt into a multi-part robot arm model with motion logic, a viewer, and export files.

Done with CodexClaude CodeΒ· Advanced

What they did
Jake Fitzgerald added an open-source text-to-CAD skill to Codex using GPT 5.5. The agent wrote build123d Python, regenerated the shape files locally, and exported STEP components alongside a URDF. In a 22-second demo, a single request produced a 7-DOF arm with custom controls and working kinematics.
How it went
The output included the arm’s URDF, kinematics, GUI, and STEP assembly, but the gripper was left out. Fitzgerald said doing the same work by hand would usually take weeks and involve about six tools. Some commenters also doubted the joint limits and whether every piece would fit together.
Tips
This approach worked because the system first turned a short ask into a fuller spec. If your request is too broad, the result will probably be weaker, so spell out the parts, movement limits, and file types you need.

Try it yourself with Claude Code

I want to model [mechanism or robot] with a text-to-CAD workflow. First, turn my short idea into a complete build spec that includes [dimensions], [number of joints], [motion range], and any assembly constraints. Then create the model in [tool or code format], save each part as its own STEP file, and add a simple viewer or GUI for checking the assembly. When the design is ready but before any final action such as exporting, submitting, sending, deleting, or paying, stop and ask for my approval. Also list anything you could not model confidently so I can review it myself.

Fill in the [brackets]. Agents can make mistakes, so review anything before it is sent, paid or deleted.

Read the original on en.kocpc.com.tw β†—

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