Yeah, I still expect to do a lot of manual work with this kind of thing. By "this kind of thing", I mean any kind of complex visual thing in SVG. I haven't tried any kind of 3D or circuit layout, yet, as it's just not something I do often, but if models could do it, I probably would do more of it...I have a 3D printer, but too slow at 3D modeling to ever want to do anything custom, and I do electronics projects occasionally, but have never had my own boards printed for the same reason. But, I would expect the capability of the models for 3D and circuits to trail SVG, simply because there's certainly less training data and 3D can be wildly more complicated than the average SVG.

For basic 3D models (think project boxes, adapters of one shape to another etc.), give OpenSCAD a try. Add "BOSL2" library into it if you need threads or some extra niceties.

It's not a CAD in the traditional sense, but since it's basically a scripting language for 3D primitives, it works surprisingly well in LLMs. And since it's just text, there's not even any MCP or agents necessary (though it can save some time).

Basic test : open a chatbot of your choice (I've tried Gemini 3.8), ask it for some basic box for your model of Arduino, or give it some napkin drawing with dimensions and ask it to give you an OpenSCAD code for it. Then paste to OpenSCAD, render, take a screenshot and mark on it what you don't like and prompt again. Usually it's pretty usable within 2-3 such iterations.

It's surprisingly good but you have to have a bit of "theory of mind" to get what and why it can do graphical manipulations. Somehow Claude can draw 3D object wireframes but struggles to know where to draw the leader for a label in a diagram.

Also funny you should say you're too slow at 3D modeling but interested in using LLMs to do it. I'm on the other end. Not speed demon, but generally it's a lot faster to generate the geometry myself than to try to describe it. There's a lot of "how you got there" stuff that matters a ton for parametric modeling. If you want a CAD model that can easily be worked with you have got to be a bit smart about it, and I am not sure I see LLMs having that kind of spatial intelligence + deep physical world context soon. For one thing, it's a lot harder to do RL on.

My gut says that both (pcb and svg) would be much further along if current models could use tooling designed around how AI works