How to Fix Failed 3D Prints

Don't Throw It Away Yet

Every 3D printer owner has walked back to their printer only to find a tangled mess of filament where a perfect model should be. Failed prints are part of the hobby — but most failures have simple fixes. Here's a troubleshooting guide for the most common problems.

Problem 1: First Layer Won't Stick

The first layer is the foundation of your entire print. If it doesn't stick, nothing else matters.

Fixes:

• Level your bed — this is the #1 cause. Use the paper test: a sheet of paper should drag slightly between the nozzle and bed
• Clean the build plate with isopropyl alcohol (IPA). Fingerprints = oils = no adhesion
• Increase bed temperature by 5°C
• Slow down the first layer speed to 15-20mm/s
• Use a brim (5-10mm) for better surface area
• Apply a thin layer of glue stick on glass beds

Problem 2: Stringing

Those wispy threads of filament between parts of your print? That's stringing, and it's caused by filament oozing from the nozzle during travel moves.

Fixes:

• Enable retraction (usually 4-6mm at 25-45mm/s for Bowden, 0.5-2mm for direct drive)
• Lower print temperature by 5-10°C
• Increase travel speed
• Dry your filament — wet filament strings much more
• Print a retraction tower to find optimal settings

Problem 3: Layer Shifting

Layers suddenly offset horizontally, creating a staircase effect. This is usually a mechanical issue, not a software one.

Fixes:

• Check belt tension — belts should be tight like a guitar string, not floppy
• Tighten grub screws on pulleys (especially the ones on stepper motors)
• Reduce print speed — going too fast can cause skipped steps
• Check for loose cables catching on the frame

Problem 4: Under-Extrusion

Gaps in walls, weak infill, or thin layers indicate your printer isn't pushing enough filament through.

Fixes:

• Increase print temperature by 5-10°C
• Check for a partial clog — do a cold pull (heat to 230°C, push filament through, cool to 90°C, yank it out)
• Calibrate e-steps: mark 100mm of filament, extrude 100mm, measure the difference
• Replace the nozzle — they wear out, especially with abrasive filaments
• Check the extruder gear for filament dust buildup

Problem 5: Warping

Corners of your print lift off the bed, especially on large flat prints.

Fixes:

• Use a brim (10-15mm width)
• Increase bed temperature
• Eliminate drafts — close windows, consider an enclosure
• Use a PEI build surface — the best adhesion surface for most filaments
• Reduce infill on large prints to minimize internal stress

Problem 6: Elephant's Foot

The bottom few layers bulge outward, making the base wider than the rest of the print.

Fixes:

• Raise the Z offset slightly (0.02-0.05mm) — you're squishing the first layer too much
• Lower bed temperature by 5°C
• Add a small chamfer to the bottom edge in your slicer

Prevention is Better Than Cure

Most print failures come down to three things: bed leveling, temperature, and filament quality. Keep your printer maintained, use quality filament, and don't be afraid to print calibration tests. A 10-minute calibration cube can save you from a 12-hour failed print.

Looking for calibration models? Search for "calibration" or "test print" on 3DSearch to find temperature towers, retraction tests, tolerance gauges, and more across all platforms.