FDM Print Troubleshooter

Thin hairs or webs of plastic strung between separate parts of the print, especially over travel moves.

Corners or edges lift off the bed and curl upward; bottom of the part bows.

First layer won't stick, detaches mid-print, or whole part pops off the plate.

Thin, gappy, or missing extrusion; weak walls; visible holes between lines.

Layers abruptly offset sideways partway up the print.

Holes, gaps, or fuzzy bumps on the top surface; infill shows through.

Bottom few layers bulge out wider than the rest of the model.

Small bumps or pimples on the surface, often at the seam or layer change.

Layers split apart, especially on taller parts or ABS/ASA/PETG.

Extruder clicks, skips, or stops feeding; nothing comes out.