3D Printing Troubleshooting

This category collects cross-printer fix guides for the most common FDM defects: stringing on walls, first-layer adhesion failures, under- and over-extrusion, layer shifts, ghosting (wall echo), and gaps between perimeters. Every article is tied to a symptom and gives a step-by-step diagnostic flow that works on any FDM printer — from a budget Ender 3 to a Bambu Lab X1C. No vague tips and no "one trick fixes everything" claims.

Most defects repeat across models: stringing comes down to filament drying (nylon, PETG and polycarbonate absorb moisture within 24 hours) and retraction tuning, warping to a clean bed and the right temperature, layer shifts to belt tension. Each guide starts with how to identify the defect from a photo and ends with quick checks to run before swapping parts or nozzles. If quality suddenly dropped, start with the extrusion and temperature guide. If ghosting appeared after a filament change, look at the vibration block.

Related reads: materials and filament drying, routine printer maintenance, and the full articles list.