alt Hacker NewsClaude Code is now WAY better at the freecad python api. My product (related to ceramics) does a whole bunch of custom 3d modeling and the new generation of LLMs can go in and make significant changes and basically get it right. They can also deal with a lot of annoying corner cases when you run into them.
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I've also had really good success with FreeCAD, and the FreeCAD MCP server. So far I've had it design and build a custom workbench (woodworking project w/ cut list, assembly and hardware instructions, tool and part check lists) as well as a omni-directional differential style robot wheel module for a 3D printing.
I will say the differential wheel module was on the edge of what it was able to do. I had to bump it up to Fable and if I didn't already have a clear model in my head of what I wanted I don't think it could have pulled it off.
I'm now printing my 3rd or 4th totally Claude-generated 3d printed custom project enclosure. Opus 5.5 is quite good - it's been generating CadQuery scripts and exporting them as STL for me, along with image previews and so on.
OpenSCAD as well. I bounce back and forth between the two of them a fair bit depending on what I'm doing and which one's going to be more ergonomic for the problem at hand. The Fusion 360 built-in chat thing... not so good in my very limited experience.
In my experience the MCP is not needed, it just runs headless FreeCAD using CLI. The MCP can be useful if you want to run FreeCAD on a VPS, and then use ChatGPT e.g. on your phone (optionally via voice). But for local I'd go with the CLI. But they'll do just fine with the MCP, which probably wraps the Python API anyway (ideally, otherwise it could lack some features).