We’ve been printing with our new Taz 5 for just over a week. The last print only half finished, and now we’re having trouble getting the filament to extrude. We are using ABS at the moment. When I pulled the filament out of the rollers, there was an area that had been chewed away in a helf0moon shape. I broke that off and put the filament back in. A small amount of material does come out when I press extrude, but not as much as usual. Another half-moon area formed almost immediately. Do you think the nozzle is partially clogged, or could there be a problem with the rollers?