Mirror feature not working

[Anonymous]

Hello,

I am wanting to mirror a feature from one body to another directly opposite. It is a negative extrusion (cut). I am selecting it from the timeline, mirroring and using a face as a plane directly in the middle of the two bodies.

It then previews it fine. I press ok and nothing happens, it doesn’t mirror it, no errors, same thing if I click different options (identical, adjusted). It does show that it has mirrored something on the timeline. 
I would really appreciate any help with this!! 
Thanks so much 

[jeff_strater]

this is a known limitation with all of the feature pattern types (mirror is just another type of pattern).  They do not work cross-body.  If the bodies are identical, apply the features to one, and use Mirror Body to mirror the entire body

[Anonymous]

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@jeff_strater wrote:

this is a known limitation with all of the feature pattern types (mirror is just another type of pattern).  They do not work cross-body.  If the bodies are identical, apply the features to one, and use Mirror Body to mirror the entire body

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Thanks so much for your message. 
Unfortunately I cannot mirror body as the face in the middle has extrusions etc, it is not symmetrical, so the bodies are slightly different. Is there any other way of repeating my extrusion without having to try and recreate the sketch exactly on the other side? 

[TrippyLighting]

Please export your design as a .f3d file and attach it to the next post.

[jeff_strater]

there's no quick, simple answer here - it will depend a lot on what the bodies look like, etc.  Often, you can use Mirror Body if you choose the right time to mirror it - model one side up to the point where you've added all the geometry that is identical, then do the mirror, then add the features which are applied to only one side, or which are different on one side than the other.  This is the beauty of history-based modeling.  Features are executed in a certain order, and you can use that to your advantage.

Alternately, this may be a case where a sketch mirror could be appropriate, depending on the sketch complexity, etc.

There are probably lots of ways to get to the same end result