question from a non-graphic designer here.
All the examples I have seen at saving slices as separate images rely on using "Save for Web". What if I want to do the same when saving for printing?
Crop the image before saving. Photoshop CS6+'s crop tool (in the toolbar, shortcut C) allows you to crop an image without actually removing the content you crop away. All you have to do is uncheck the 'Delete cropped pixels' box.
When you're done saving (as), select the crop tool again and crop your next slice.