I just got a print that was better than anything else today. Not great but at least it was recognizable. I re-calibrated everything and cut the first layer speed down to like 1/4 speed. I'm thinking you might be right about the nozzle. Everything was fine until yesterday. It was having trouble pulling filament in, which I figured out was because there was too much tension on the filament because there was too much friction between the spool and spool-holder. (I had to print a new spool-holder because the stock one was too small) Once I figured that out I put some silicone on the spool holder and got a great print. Got up this morning and everything started jamming up. All I can figure is that somehow the feeder gear might have somehow gotten damaged but I can't think that filament would do anything to that, no matter how much it was grinding away. What do you think?