There's a bug in printing on some combinations of Intel Macs and printers.
This will be resolve in the upcoming release of ArtRage.
It's in Beta testing now, and will be released Very Soon!
As a workaround in the meantime, you can export your painting as a PNG (File menu, Export as Image, choose PNG type) and print it from another application. (If you have Another Digital Painting application, you can also export from ArtRage as a PSD for use)
Sorry for the hassle. All will soon be fixed!
AndyRage's mantra for graphics engine code:
"Sure - how hard can it be?"