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I've been doing a lot of 3D design in Codex GPT 5.5 (I found Opus 4.7 wasn't as good - haven't experimented much with 4.8 or Fable).

OpenSCAD is a parametric CAD programming language, and the models know it well.

The biggest challenge is communicating words like "inside" and "above" to the model - inevitably it's idea of which direction is which is often different.

I can't say I've done anything very hard, but for things like ESP32 cases, or parametric rod connectors it is great.

You can do things like "add snap connectors" and it'll do a great job.



Can you share prompts and the output? I’ve tried building fairly simple models and it doesn’t grasp that I am building a solid object.


It's not one prompt, but here is a parametric rod connector:

  Use SCAD and design a connector for square rods.
 
  The rods are 18.2 mm square. I want to connect two end-to-end.
..

  make if the bolt holes are created optional for each side - I want to set them separately. Make them M3.5 countersunk
..

  it's the +X or -X sides I want to turn the screw holes on or off.
..

  on each of the 4 sides of the connector add additional connectors at 90 degrees. Make each optional
etc etc




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