How would you go to make the llm generate object easier to 3d print (or manufacture)? Things like not using too much material, reducing the need for support, and maybe whether or not the produced part would be tough enough.

Are there some datasets where some LLM learn to interact with some slicers, some Finite Elements Analysis software, or even real world 3d-printed objects to allow the model to do some quality assessment ?

Interesting idea. Our framework of having multiple different agents with different roles could play well with this. You could create an agent that checks for certain criteria, gives feedback to the coding agent. For example, you could build an agent that evaluates the toughness of the current 3D asset and suggests fixes. I like the idea of incorporating additional experts to solve different tasks!