I would suggest searching 3880 maintenance mode features.
I've been searching for this feature on my R2000 and have only just found it.
I even went to the Epson support chat facility and they said the R2000 did not have the feature!!
It's a separate utility called "Power Off Timer" and is on the Epson disc - mine must have got un-installed accidently so I've now re-installed.
See screen shots below. You can see my R2000 is set to power off after 2 hours but it is possible to set it to "never".
This is what you would need to automatically run unclogger at over a period of time.
Terry