Hi DS,
IMO--

Even the slightest vibration MAY hurt the HD by way of a bad sector here and there.
So if you can locate your printer , say on a shelf or a printer cart , then that`s what I would do. If for no other reason than peace of mind.
Always better safe than sorry .
Mac`s are a strong computer but a HD is a HD and every little "bump-in-the-night" (or day) you run the risk of doing harm.
jedi
