Bed Adhesion
Print not sticking, lifting corners
Stringing
Thin strings between parts
Warping
Corners curling up, deformation
Layer Issues
Visible lines, poor adhesion between layers
Clogs & Jams
Filament not extruding
AMS Problems
Multi-color / feeding issues
Layer Shifting
Print moves sideways mid-print
First Layer
Too close, too far, or uneven