Why Prints Fail — and How to Fix Them
Every 3D printer operator, from beginners with their first Ender 3 to experienced users running multi-material Bambu Lab setups, encounters print failures. The good news is that most problems have well-known causes and straightforward fixes — you don't need to guess.
This troubleshooting guide covers the 12 most common FDM print problems: warping, bed adhesion failure, elephant's foot, stringing, under-extrusion, over-extrusion, layer separation (delamination), ghosting/ringing, Z-banding, pillowing, poor bridging, and clogged nozzles. For each issue, you'll find a visual diagram showing what the problem looks like, a list of symptoms to confirm you've identified the right issue, the most likely causes ranked by probability, and step-by-step solutions you can apply immediately.
Start with the diagnostic questionnaire below if you're unsure what's wrong. Select when the problem occurs (first layer, during the print, on the surface, or overall), and we'll show you the most relevant issues. Or scroll down to browse all 12 problems directly — each card is self-contained with everything you need to diagnose and fix the issue.
These solutions are based on real-world testing across multiple printer brands and filament types. Temperature values, speed recommendations, and retraction settings come from actual print sessions, not theoretical calculations. When a fix depends on your specific material, we note it — what works for PLA won't always work for PETG or Nylon.