An actual print button, as I understand it, is far more complicated than you’d expect. It might be possible to rig something up to do it, but it would be tricky. I’ll consider looking into it once everything else I have planned is done.
This technically is more of a javascript issue, though, you might be able to get a more expedient answer by contacting the slimbox creator on his website.
A link to another page with just the plain image is a bit more doable, in fact, I believe it’s currently capable of this. I’ll get back to you on how once I can track it down.