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If you’re looking for 3D modelling in real programming languages, I’ve very much enjoyed IceSL, which embeds Lua: https://icesl.loria.fr/

I used it to design this piece for use with Gravitrax, for example: https://share.icloud.com/photos/0b2yeTGdLftZV17btg-KTEYog

> I’ve very much enjoyed IceSL

Heavy bias on 3D printing though.

At first glance, doesn't look as general as other CAD tools.

Yes, all true. You can in principle export to STL but it doesn't work very well.

Can you share this design? My nephew spends untold hours playing Gravitrax.

The code isn't at all well-structured or documented. It needs external power and is designed around this motor: https://www.amazon.co.uk/gp/product/B009AQLDSS.