I have a Samsung color laser printer on my Ethernet, and my Mac stays on 24/7 serving as a Google Cloud Print server to bridge the printer in.

If you're printing in portrait mode, then everything works. In landscape mode, nothing works and it's immensely frustrating. Furthermore, Samsung's print drivers on the Mac are desperate to waste your color toner, forcing you to select "advanced black optimization" every time you print. There's no way to select this from the GCP dialog.

(And Samsung hasn't updated the firmware since 2012...)