Troubleshooting
Describe what's wrong with your print and pick the closest match. Each problem lists its likely causes, easiest to check first, and what to change. These are for FDM (filament) printers.
All problems
Bed adhesion
Prints that won't stick, come loose or won't come off.
Extrusion
Too much, too little or no plastic, plus strings and blobs.
Surface quality
Lines, ripples, rough patches and holes on the outside of the print.
Strength and shape
Parts that split, lean, shift or come out the wrong size.
Filament and hardware
Problems that start with the spool, the extruder or the hot end.