In the Virtualbox settings for Ports, "Enable USB Controller" is checked but greyed out, the "Enable USB 2.0 (EHCI) Controller" is unchecked and greyed out. Under that I added a Filter for the specific printer model.
Device Manager shows no printers but under USB controllers it now lists "USB Composite Device" with one of those lovely yellow warning triangles beside it. Trying to update drivers for that device won't work, it says "This device cannot start. (Code 10)".
Running out of things to try now. I've altered settings and restarted Windows more times than I care to count! Wow, a whole afternoon spent on Windows, getting nowhere. Just like the old days.
Any ideas on other settings to possibly switch/delete/install would be welcomed.
[The printer is Kodak Hero 5.1, Windows is Server 2008.]