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Have owned S3 for about 7 months, reliable until now. The past few days I have ran into extrusion issues where part of the first layer prints nicely, but at some point on the first layer it stops extruding or just extrudes a tiny amount which doesn't even stick to the plate. Its a weird issue, because the for the first 10 minutes, the first layer (the brim) looks great.. However, extrusion usually fails during the first layer. Things I have tried: 1) Swapped out print cores and cleaned print cores several times. 2) Cleaned feeder mechanism thoroughly. Tried various tension levels. Cleaned bowden tubes. 3) New filament roles. (PLA) 4) Reset Cura settings. changed speeds/temperatures. 5) Re-leveled my table. 6) changed out the silicone cover that protects the print heads as it was slightly damaged. 7) Cleaned the fan on the print head cover. It had some fine straw in it. although I dont see this fan turn on during the first layer, should it? Things I haven't tried but am considering: 1) building a filament holder and putting filament on the floor. I use the stock filament holders. 2) More investigating into the fans? i read on another thread that a faulty fan can cause this. 3) ??? Input appreciated.