Well, because you need a geometric modeling kernel to generate BRep CAD models, it really has nothing to do with training set as it is very, very, difficult to make one.
Lucky for you, I made one that you can try out for vibe-CADing.
https://github.com/yuechen-li-dev/Aetheris/
I don't really want to self promote too much here, but currently the other options to do LLM CAD are ecto's vcad, use CadQuery/build123d to access OCCT, or get Onshape for FeatureScript, in case you want to compare the field.
modeling isn't the hard part. It's decomposing it into usable chunks, the knowledge of what's going to be a problem, etc.
either way, give an actual CAD program like fusion a go. No, not the FOSS stuff- the real stuff. Although, some of them are "close, but no cigar" these days. Not like gimp which is an exercise in self-flagellation.
Ive had great success with asking claude to use openscad for part design.
Because it’s parametric design as opposed to modeling, it inherently lends itself to making it easier to build.
Use metric units when prompting, and Ive even drawn sketches to add to context, and be surprised at how good the outcome can be!
What are some things you’ve made?
This exactly. It can write code, compile it, render and inspect it. It took quite a bit of back and forth but I got Claude to generate a complex mating part from a 3D scan.