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Understanding primary instance
I did a search but I still don't understand what a primary instance actually is. While building I get seemingly random messages that I need to go set a primary instance but I don't understand why. I just noticed tonight that the in-context arrows in the assembly part list has two types of arrows. Solid and dashed. It appears that for any given part studio you can have a single part active as the primary instance at any time. (Probably where that primary word comes in.) However toggling between parts does not appear to have any impact on in-context building just as long as I have at least one set. In what scenario does it matter which one I choose and why?