I've mostly been doing 5-6 hour prints tops, so haven't really noticed this until now, but... The RRW graphic LCD included with the BigBox appears to have one big bug - the longer it's on, the lower its contrast gets. I've been running several 8 hour prints back-to-back and after the first one, i had to tilt my had almost level with the printer bottom to read the display. I'm nearing the 16 hour mark now and the LCD is nearly completely unreadable. If i were to guess, i'd say that either the contrast trimmer, or some resistor on the board results in such a drift in the contrast control voltage that it makes the LCD unusable after a few hours of work (and, say, 10 degrees of temperature differential).