Need to rotate the UCS in a part

Hello everyone:

Please see the attached image...I need for the "Z" in that image to be straight up and down for machining purposes.  (In this image, the image is sitting squarely on top of the Top plane...but the Z axis is still at 45 degrees)  This is ultimately an eight-sided part that I want to machine out of wood using Vectric's Cut3D.  Multiple GCode files will be generated and machined individually, and the material will be rotated 45 degrees at a time to do so.  The import into Cut3D will not work if the the Z axis is not straight up and down.  How can I do this?

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