I'd be interested in hearing more about this.
Is it really that simple... "power down - don't worry?"
I've never learned about any other printer than my mimaki, but mine is set to pull some ink through the heads into the waste receptacle ever 30 minutes or so, and since it doesn't wan't to pull air by accident, it shuts that feature off when any one cart is out.
So, if this were happening on a Mimaki, 24 hours without a clean cycle that is designed to run 48 times in that period would be a problem to me. I don't know how bad the problem would be & I hope i never do, but I would drop my heads into soak cleaning mode in the capping station. Barry from printingdigital.net told me how to do that when the same thing happened to me on a Friday night & I was out all weekend.
Is the Roland really that much different that you don't need to get your print heads soaking in a solvent during the wait?