The top five common 3D printing failures are:

1. Warping or Curling: This occurs when the first layers of the print do not adhere properly to the print bed, causing the edges to lift and warp. It can be caused by poor bed adhesion, incorrect bed temperature, or environmental drafts.
2. Layer Shifting: This happens when layers of the print are misaligned, leading to a shifted or slanted print. It is often due to loose belts, improper motor settings, or collisions between the nozzle and the print.
3. Stringing or Oozing: This is when thin strands of plastic, like strings, are left between different parts of the print. It’s usually due to incorrect retraction settings, excessive print temperature, or fast travel speeds.
4. Under-Extrusion: This failure is characterized by thin layers, missing layers, or not enough filament being extruded. Causes include a clogged nozzle, incorrect filament diameter settings, low extruder temperature, or a malfunctioning extruder.
5. Over-Extrusion: Opposite to under-extrusion, over-extrusion happens when too much material is extruded, leading to blobbing, zits, and rough surface finish. This can be due to incorrect extrusion multiplier settings, filament diameter settings, or extruder calibration.