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I have not used my cubex duo for a couple of months, and when I started to use it again I kept getting a filament flow failure message after about 4 or 5 hours into a print. I thought maybe it was because I was using an old spool of abs. So I ordered a new spool and got the same message. My prints are coming out better than I have ever gotten the machine to work, but they keep stopping before they are done. The message comes up at random times during the print and stops the print instantly. It has happened on both extruders now.