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I have a parent with a lot of children. I want to use an array modifier on the whole lot of them, including the parent, but, when I add an array modifier to the parent, only it gets duplicated.

One sort-of-solution I found is to Duplicate Link the parent along with its children, but this requires fiddly manual positioning that I'd like to avoid, and I also think this would make it difficult to add a child. The other solution I found is to add an array modifier to the parent and every single child; although this method does what I want in theory, it's still a lot of clicking.

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Create your parent object, then create one child. copy the array from the parent to the child Ctrl-L. next take the child and add drivers to all of the parameters in the array modifier that you want to auto update. now copy the drivers and array modifiers onto all of the other children. Done!

Using drivers is tricky, Here are some tutorials:

https://www.youtube.com/watch?v=o4qYHNA_x4Q

https://www.youtube.com/watch?v=ajMAvKRCTBg

How to copy drivers onto multiple objects

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    $\begingroup$ Can you please add some detail? I have never used a driver. $\endgroup$
    – catlover2
    Commented Jun 22, 2014 at 0:20
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    $\begingroup$ A bit disappointing that array modifiers don't copy objects with their children but this solution works like a charm and isn't too hard to set up. @catlover2 Although I know it's more than a year later I still want to mention that Mastering Drivers has been an excellent resource for me to fully understand drivers in Blender. $\endgroup$
    – wout
    Commented Aug 22, 2015 at 16:17

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