I use my R3000 rarely and test print it often. While fighting the clogged and air bubbled lines a new approach was suggested by Walker in tech support. First use a plastic cover (I currently use a towel.) and a guitar humidifier to keep things from drying up. Here in AZ it makes perfect sense. These humidifiers appear to be high density sponges in a ventilated plastic holder and run from $6-$20. I just ordered a $13 Amazon unit. Like I said, makes sense!