Reversing a print to create a mirror image (for left & right side parts)?

Hey guys

I just started playing with sketchup a bit and last night created a bracket to hold a big paper towel roll to my tool trolley out in the garage.
I need to print one that faces the opposite way now, but I'm not sure where/how the easiest means is of doing this.

Is there a setting in Sketchup/Repetier/Slic3r that would print a mirror image somehow? Or do I have to create a 2nd stl file facing the opposite way?

Have been looking but not found anything so far.

I've attached the file for the first side (it's "unfixed" by the way).

Thanks!

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Prusa Mendel i2 - Melzi V2

Never mind guys - I searched more and found what I needed.
Mostly I had been looking at Slic3r and Repetier rather than sketchup, but here's the way to do it (yes it means a second, mirrored model):
[help.sketchup.com]

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Prusa Mendel i2 - Melzi V2

Netfabb also does it easily.

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Waitaki 3D Printer

I used to go through a lot of work mirroring stuff, but then one day I realized you can do it with the "Scale" option (in Repetier, at least).

If you scale just the x or the y by -1, it will mirror.

Cool!

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Waitaki 3D Printer