I am trying to save file size when making a large assembly. when I take an assembly and save it as a part file, the part file is larger than the assembly. how can I make the part file smaller?
you could, after saving as part reduce it's image quality in here:
The assembly file doesn't hold all of the parts, it's mostly references, mates, that sort of thing. That's why it will become larger when saved as a part.
SolidWorks files are in fact a container for multiple files. There's at least a parametric model, a tessellated (made out of triangles) model and an thumbnail image in there. It's the quality of the tessellated model that can be changed as shown above to change the file size. You could also consider cleaning up the part/assembly files by removing unnecessary or broken surface models and imported models.
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