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heres what i always have it set at...if you wanted to work on something smaller and to scale (like a bottle or something), youd set it to mm, and if you wanted to work on something larger and to scale (architecture guff), then youd want metres etc. etc.
i think youll have to hit reset, change the system unit to cm, then reopen the car file and select "scale to system units" in the box that should pop up
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