What is wrong with my print? 3D print diagnosis in 2 steps

Pick where you see the problem and what it looks like: we show the most likely causes, what to try first and which guide to read.

All symptoms and guides

• Corners lift or the part peels off the plate
• The filament does not stick at all or the lines stay loose
• The bottom edge is squashed and wider (elephant foot)
• Layers separate or cracks appear
• There are gaps, thin lines or weak walls
• Thin strings appear between parts (cobwebs)
• Bubbles, popping sounds and a rough surface
• The underside of bridges sags
• Overhang edges curl or look rough
• Bulges at corners or uneven lines after turns
• Walls too thick or too thin, uneven surface
• I do not know which temperature to use for this filament

These are general pointers: values depend on printer, filament and environment. Change one thing at a time and test again.