Hey guys! So I'm new to 3D printing and its super fun. I have a ender 3 and at first it was printing the dog test, printed out small keycaps. All of a sudden, no PLA filament came out of the nozzle. I put a new nozzle in, checked bowden tube gap, and bed is leveled. I'm not sure what to do now. Any help or tricks would help.Thanks!