@dave r said:

I think you missed attaching the file. Or are you sending it via private message?

This is my first attempt at forum stuff, I thought i attached it but obviously didn't go.
I uploaded it...let me try again. If you don't get it maybe direct me to the "How to attach a file-for dummies" page.
Thx

@dave r said:

Perhaps you could share the SKP file? I can think of several reasons why you might get the wrong angle. As pbacot asked, what method are you using to mirror the rafters? How you do it will be important.

Hi, I got the rafters to mirror properly but the low roof intersections are still not meeting on the flip-along object. I'm sending the file in hopes you may solve this.
Also, how can you determine the axis of a group for the flip-along?
Thanks
Jurgis

I'm having accuracy problems when mirroring groups of objects. I have a series of roof joists at a 10:12 angle, after copying and mirroring, the newly mirrored group doesn't match the original angles.
I've checked to make sure the original is properly aligned with the axis. Any one having similar issues?