Underneath are the most common issues regarding the quality of your filament presented. Select the problem that looks similar like you encounter.
Nozzle Build-up
Bumps/particles in Filament
Output Too Low or Too Thin
Polymer Degradation
Abnormal Smoke Production
Output Is Too Liquid
Filament Thickness Deviation (Inconsistent diameter)
Oval Or Flat Filament
Air Bubbles Or Holes In Filament
Rough Filament Surface